问题

There’s no way of knowing why one man makes an important discovery __ _ another man, also intelligent, fails.

A:since
B:if
C:as
D:while

正确答案是：

同类题型

No. Two High basketball team ______ won theFriday night game with a score of 100-99.

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You _______ pay too much attention to your reading skill, as it is so important.

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Could you do ____ for me, please Yes, with pleasure．