单项选择题

While he was in Beijing, he spent all his time_______some important museums and buildings.

A．visiting
B．travelling
C．watching
D．touring
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单项选择题
The Clarks haven’’t decided yet which hotel_________.
A．to stay
B．is to stay
C．to stay at
D．is for staying
单项选择题
My sister’’s professor had her ______her paper many times before allowing her to present it to the committee.
A．rewritten
B．to rewrite
C．rewrite
D．rewriting
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