单项选择题

Only if you work hard every day ______ pass the exam.

A．you can
B．may you
C．you must
D．must you
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单项选择题
______ illness, he went to the seaside for vacation.
A．Due to
B．According to
C．Owing to
D．For the sake of
单项选择题
— Hello, is that Mrs Black speaking— Yes, who's that— ______ Mary.
A．I'm
B．That's
C．She's
D．This is
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