单项选择题

John had never been abroad before, ______ he found the business trip very exciting.

A．because
B．though
C．so
D．while
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单项选择题
______some students are able to find employment after graduation, others will have to return to school and earn an advanced degree.
A．Since
B．While
C．Because
D．If
单项选择题
It is important that we______ the task ahead of time.
A．will fish
B．finished
C．finish
D．shall finish
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