单选题：It is no use__________ that you didn't know the truth.

题目内容：

It is no use__________ that you didn't know the truth. A．pretend
B．to be pretending
C．pretending
D．Pretended

参考答案：

答案解析：

What\we must do now__________make a careful investigation o

What\we must do now__________make a careful investigation on the circumstances.

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