问题描述：
At no time during his speech ________ that he would make another film soon.
A.he mentioned
B.he should mention
C.did he mention
D.should he mention
这道题正确答案选择C,请哪位老师解答一下,为什么呢?
A.he mentioned
B.he should mention
C.did he mention
D.should he mention
这道题正确答案选择C,请哪位老师解答一下,为什么呢?
问题解答：
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