单项选择题

He doesn' t come today. He ______ be ill.

A． must
B． can
C． should
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单项选择题
He ______ asleep when he was reading.
A． was falling
B． fell
C． falls
单项选择题
Xiao Zhang ______ in this company for three years.
A． has worked
B． worked
C． works
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