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问题

Scientists say it will be five or six years __________ it is possible to test this medicine on humans

A:after
B:before
C:since
D:when
正确答案是:
同类题型

Readers can ___ very smoothly without knowing the exact meaning of each word.

Everyone in my class _______ the poor boy without parents.

He should have come to join in the thorough cleaning. —–He________, I think. It’s not his turn.

My brother is good ______sports, and he is good _______ his friends.

The film _______ for twenty minutes when they got to the cinema

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