单项选择题

The person who ______ this type of research deserves our praise.

A．originated
B．manufactured
C．generated
D．estimated
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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
单项选择题
The microscope can ______ the object 100 times in diameter.
A．magnify
B．increase
C．develop
D．multiply
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