问题描述：
He insisted that he_____that and that he_____free.
A.didn't do:was set
B.hasn't dong:is set
C.hadn't done:be set
D.hadn't dong :should set
选什么?为什么?
A.didn't do:was set
B.hasn't dong:is set
C.hadn't done:be set
D.hadn't dong :should set
选什么?为什么?
问题解答：
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