I asked him whether he had done all the work himself whether he had had any assistance.A.

I asked him whether he had done all the work himself whether he had had any assistance.
A. and
B. but
C. nor
D. or

A. andB. butC. nor(答案→)D. or解析：因为只有or才能表示选择，意为“(是…) 还是”。

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