单项选择题

I remember ______ the door before I went to bed.

A．locking
B．to lock
C．to have locked
D．being locked
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单项选择题
The microscope can ______ the object 100 times in diameter.
A．magnify
B．increase
C．develop
D．multiply
单项选择题
I never trusted him because I always thought of him as such as a ______ character.
A．gracious
B．suspicious
C．unique
D．particular
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