I asked him whether he had done all the work himself___whether he had had any asistance.

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问题 I asked him whether he had done all the work himself___whether he had had any asistance.

选项 A、and
B、but
C、nor
D、or

答案D

解析 因为只有or才能表示选择,意为“(是……)还是”。
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