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
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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
单项选择题
Not until she arrived at the meeting room ________ she had forgotten to bring the document.
A．she realized
B．did she realize
C．she did realize
D．does she realize
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