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
The red suitcase is expensive______it's made of leather.
A. because
B. if
C. though
单项选择题
Xiao Zhang ______ in that factory for five years.
A.is working
B.works
C.has worked
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