People used to think that the surface of the moon was smooth, ______?A、don’t the

游客2023-10-03 44

问题 People used to think that the surface of the moon was smooth, ______?

选项 A、don’t they
B、wasn’t it
C、didn’t they
D、usedn’t they

答案 C

解析 used to do翻译为“过去常常……”，时态为一般过去时，因此对动词used的反意疑问部分应用一般过去时didn’t，而不是usedn’t.

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