单项选择题

She thought I was talking about her son,（）, in fact, I was talking about my son.

A．whom
B．which
C．while
D．where

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单项选择题
For passengers, ships have the advantage of（）cheaper than trains or planes.

A．having been
B．to have been
C．being
D．to be
单项选择题
Only under special circumstances（）to take make-up tests.

A．are freshmen permitted
B．freshmen are permitted
C．permitted are freshmen
D．are permitted freshmen
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