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A. whenB. howC. that D. if

A．on B．against

C．from D．over

A．it B．that C．which D．what

【題目】It's a pity that he failed some exams and didn't have enough____to graduate this year.
A.credits
B.praises
C.awards
D.rewards

A．that B．what C．which D．where

A. whatB. howC. that D. which

【題目】They were lost at sea, ____ wind and weather.
A.at the cost of
B.at the risk of
C.at the sight of
D.at the mercy of

A．grew B．growing

C．grown D．to grow

【題目】____these experiments are interesting, it's important to remember that they may not always tell us much.
A.While
B.When
C.As
D.Since

A. in whichB. whatC. where D. that