单项选择题

It has not been decided ______ we shall hold a meeting tomorrow.

A．what
B．whether
C．whom
D．which
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单项选择题
Not until I had read your letter ______ the true state of affairs.
A．I understood
B．did I understand
C．I did understand
D．I understand
单项选择题
I put my book on the desk, but now it's gone. It ______.
A．may be stolen
B．must be stolen
C．must have been stolen
D．must have stolen
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