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the staffer said he did not know _____the meeting.

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the staffer said he did not know _____the meeting.
a.when we started b.when will start c.when would start d.when to start
答案及原因(详细)
listen!helen is singing in the next room .
it ____be helen,she is gone to beijing.
a.can't b.mustn't c.may d.should
the staffer said he did not know _____the meeting.
The staffer said he did not know _when we started_ the meeting.选A.
B显然错误;C项start应该在the meeting后面,而且也没有必要用过去将来时;D不定式表示将来的动作,不对.
It can't be helen.选A,表示“不可能”.