"The ground is wet." "Yes, didn't you know? ______for the last 20 minutes."
A．It's rainingB．It was raining
C．It's been rainingD．It has rained
C
時間狀語for the last 20 minutes，表示的是過去的一段時間里完成的動作持續(xù)到現(xiàn)在并有可能繼續(xù)下去，動詞的時態(tài)應(yīng)用現(xiàn)在完成進(jìn)行時。故選C。
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