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50、He often helps the students ______ he thinks are not quick at their studies.

A．whom　　 B．who　　 C．when　　 D．because

49、It was twelve o’clock ______ they finished the work.

A．since　　 B．which　　 C．that　　 D．when

48、Is this the reason ______ at the meeting for his carelessness in his work?

A．he explained　　 B．what he explained　　

C．how he explained　　 D．why he explained

47、My son, ______ the whole term, wants to relax himself during the winter holidays.

A．being worked hard　　 B．have worked hard　　

C．having been worked hard　　 D．having worked hard

46、______with extraordinary strength for the moment the young man raised himself completely, ______ me to stand up, too.

A．Filled; obliging　　 B．Filed; obliged　　

C．Filling; obliged　　 D．Filling; obliging

45、----I missed the film last Sunday.

　 ----Oh what a pity! I wish ______.

A．you hadn’t seen it　　 B．you had seen it　　

C．you never saw it　　 D．you saw it

44、______ the man who had not been seen for 10 years, so he ran over to shake hands with him.

A．Recognizing　　 B．Having recognized　　

C．Having been recognized　　 D．He recognized

43、He has lost his wallet again. It’s the second time this ______.

A．happened　　 B．is happened 　　C．has happened　　 D．happens

42、The doctor was surprised to find the beautiful girl ______.

A．had been driven mad　　 B．was driven mad　　

C．had been driven to mad　　 D．was driven to mad

41、______, tears came into her eyes.

A．Moving by his words　　 B．Moved by his words　　

C．She was moved by his words　　 D．Because she was moved by his words