问题

I don’t like any humor in this serious speech because I can’t think of any circumstance ______ this would be beneficial or useful.

A:which
B:whether
C:where
D:as

正确答案是：

同类题型

the "No smoking" signs have existedfor long in public places, heavy smokers oftenthem and lightup cigarettes.

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was talking with my monitor when a fight ________between the students of the two classes.[ ]

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