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问题

Scientists say it may be five or six years _____ it is possible to test this medicine to human patients

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

Mum, where did you put my new sports shoes–Oh, I put them in a box. And ________ box is underyour desk.

My teacher inspired ____ a summer course to improve my writing skills. [ ]

The little child usually felt frightened at night, so not until ___________.

_________ eight-year-old girl saw _________ UFOyesterday.

The old lady could give the child sympathy, ________ any practical help would be beyond her

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