I haven’t heard from Bill he left here.A. whenB. beforeC. sinceD. while

问题补充：

I haven’t heard from Bill he left here.

A. when

B. before

C. since

D. while

答案：

A. when

B. before

(答案→)C. since

D. while

解析：句意：自从比尔离开这里之后，我还没有收到他的信。句中用了现在完成时，since后面接了一个瞬间动作，表示点时间，故选C

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