单项选择题

A) must C) should
B) have to D) had better

A．must
B．have to
C．should
D．had better
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单项选择题
A) until C) ifB) before D) once
A．until
B．before
C．if
D．once
单项选择题
A) accept C) contactB) receive D) confirm
A．accept
B．receive
C．contact
D．confirm
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