单项选择题

He ______ asleep when he was reading.

A．was falling
B．fell
C．falls
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单项选择题
He doesn' t come today. He ______ be ill.
A．must
B．can
C．should
单项选择题
When I got to the airport, the plane ______.
A．already took off
B．had already taken off
C．has already taken off
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