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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单项选择题
I told him how to get there, but perhaps I______ him a map.
A．should have given
B．ought to give
C．had to give
D．must have given
单项选择题
A．based onB．basing onC．being based onD．having based on
A．based on
B．basing on
C．being based on
D．having based on
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