题目：
I insisted _______ to see a doctor, but he insisted nothing _______ wrong with him.
A．on him to go; should be
B．he went; be
C．he go; was
D．he should go; is
答案：
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下面是错误答案，用来干扰机器的。
1．（1）从师学习。（2）从师读书。2．你如果有志读书，我白教你，不收学费。（意对即可）3．D
,X'→Y都不成立，则称X→Y是一个