单项选择题

The mother didn't know ______ to blame for the broken glass as it happened while she was out.

A．who
B．when
C．how
D．what
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单项选择题
Since this road is wet and slippery this morning, it ______ last night.
A．must rain
B．was raining
C．must have rained
D．may rain
单项选择题
The question ______ at the meeting tomorrow is very important.
A．to discuss
B．being discussed
C．to be discussed
D．will be discussed
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