Scientists say it may be five or ten years ________ it is possible to test this med

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

请帮忙给出正确答案和分析，谢谢！

您可能感兴趣的试题

Scientists say it may be five or ten years _____

答案解析
Scientists say it may be five or ten years _____

答案解析
Scientists now believe that artificial－hip implants, previously thought to be safe, may ac

答案解析
Astronomers have discovered what may be five planets orbiting Tau Ceti, the closest singl

答案解析
What do scientists say about the collision of an asteroid with Earth?A.It is very unlikely

答案解析
Scientists say it may be five or ten years ______ it is possible to test this medicine on

答案解析
—“May I speak to your manager Mr. Williams at five o’clock tonight?” —“I’m sorry.

答案解析