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问题

Scientists say it may be five or ten years___________ it is possible to test this medicine on human patients

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

The girl is _______ her mother in many ways. For example, they are both tall and thin.

It’s easy me English. I like it.

With the situation worsening, the army threatens to ________ if a general election is not to be heldas scheduled, BBC reports.[ ]

Jim passed the driving test , ________ surprised everybody in the office.

enjoy learning English , _______it takes me a lot of time.

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