Scientistsanddoctorsacrossthew

Scientists and doctors across the world have done _____ research over the years, hoping to find a cure for cancer.

A．a great deal of	B．quantity of
C．quite a few	D．a large number of

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相关试题

Tom, together with his classmates, ______ because of _______ the school rules.

A．was punished, obeying	B．were punished, obeying
C．was punished, breaking	D．were punished, breaking

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She can’t help ______ for her family often, so she can’t help ______ why life is so hard.

A．working ; wondering	B．work ; wondering
C．working ; wonder	D．to work ; to wonder

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He started to learn English in 1990 and in the years ________ he kept on using it in his work.

A．following

B．followed

C．follow

D．that followed

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Excuse me for breaking in, ______ I have some news for you.

A．so

B．and

C．but

D．yet

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Why pleasant smells do not reduce pain in man is a question still _______ by scientists.

A．answered

B．being answered

C．to be answered

D．that answered

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