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At the sight of the policeman,_______ from behind the door.

A. did the boy rush out         B .the boy was rushing out

C. out rushed the boy            D. rushing out was the boy

   that it has been No．1 hit on the pop charts over the past month·

    A．Simon’s newly released album is very well—received

    B．SO well received Simon’s newly released album is

    C．Well．received is Simon’s newly released album

    D．So well received is Simon’s newly released album

Only after spending several nights working on the math problem         to wonder whether the problem was wrongly set.

A. had he begun         B. he began         C. did he begin           D. began he

. ____________, I wouldn’t have finished my homework.

A. If you didn’t help me                                 B. Had you not helped me         

C. If you haven’t helped me                             D. Haven’t you helped me

Hardly ______ off the bus when ______ an old friend who he hadn’t seen for years. 

A. had he got, did he meet                         B. had he got, he met

C. did he get, did he meet                          D. he got, he met

Not until they left school ______ how much their teachers loved them and helped them.

   A. they realized                                  B. did they realize       

C. they would realize                         D. had they realized     

Hardly __________ the Shanghai Expo _________ we realized we forgot our ID cards in the room.

A. we had got to ;  that                B. we got to ;  when 

C. had we got to ;  when               D. had we got to ;than

Mary was only too ready to help others, seldom, _________, refusing them when they turned to her.

       A. if never         B. if not               C. if any                 D. if ever

Not only ______ a city and a republic, but ______also to become the capital of one of the largest empires in history.

   A. was Rome; was it   B. was Rome; it was   C. Rome was; was it  D. Rome was; it was

Only when you ____ what you have learned to practice _____ say you have made it.

A. adapt; you can         B. apply; can you       C. use; you can         D. adopt; can you