单项选择题

It was essential that the application forms ______ back hefore the deadline.

A．must be sent
B．would he sere
C．be sent
D．were sent
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单项选择题
The reason for my refusal is ______ you're undependable.
A．because
B．due to
C．that
D．for
单项选择题
We ______our breakfast when an old man came to the door.
A．just have had
B．have just had
C．just had
D．had just had
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