'The ground is wet.' 'Yes, didn't you know? ______for the last 20 minutes.'
A.It's raining
B.It was raining
C.It's been raining
D.It has rained

A.'
B.'
A.It's
C.It
D.It's
E.It

【参考答案】

C
解析：时间状语for the last 20 minutes，表示的是过去的一段时间里完成的动作持续到现在并......

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