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

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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
单项选择题
She pretended（）nothing had happened.

A．as
B．if
C．as though
D．since
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