—-how longyou? —I have been skating for three weeks.

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问题 —-how long______you______? —I have been skating for three weeks.

选项 A、do; skate
B、are; skating
C、have; been skating
D、did; skate

答案C

解析由答语的时态可推断出问句也应用现在完成进行时。故选C。

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小学英语

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