There’s some doubt he’ll keep his promise.A. whether B. whenC. thatD. which

问题补充：

There’s some doubt he’ll keep his promise.

A. whether

B. when

C. that

D. which

答案：

(答案→)A. whether

B. when

C. that

D. which

解析：doubt疑惑;怀疑” ,在肯定句中doubt多接whether (一般不用if代替) 引导同位语从句。在否定句中，用that引导同位语从句。故选A。句意：有点怀疑他是否能遵守诺言。

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