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-We could have asked Mr. Zhang for help. He is always ready to help others.
-I ________ that. A long time _______.
A.have forgot, wastes B.forgot, wasted
C.forgot, was wastedD.forgot, has been wasted
C
考查时态。句意:我们本可以向张先生寻求帮助的,他总是乐于助人。我忘记那事了,浪费了很长时间。根据语境,忘记和浪费的动作都发生在过去,所以都使用一般过去式,选C。
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