单项选择题

______is often the case with children, Tom was completely better by the time the doctor arrived.

A．It
B．As
C．What
D．Which
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单项选择题
______you understand this rule, you'll have no further difficulty.
A．Once
B．Unless
C．Only
D．Until
单项选择题
There are no lights on and no one answer the doorbell. They ______ be at home.
A．must not
B．will not
C．should not
D．can not
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