单项选择题

A) even C) especially
B) as D) surely

A．even
B．as
C．especially
D．surely
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单项选择题
A) must C) shouldB) have to D) had better
A．must
B．have to
C．should
D．had better
单项选择题
A) until C) ifB) before D) once
A．until
B．before
C．if
D．once
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