单项选择题

The students didn't do ______ the professor showed them to do.

A. as if
B. as
C. after
D. although
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单项选择题
______ work has been done to improve the people's living standard.
A. Many
B. A great many
C. A large number of
D. A great deal of
单项选择题
The old photograph ______ many memories.
A. brought on
B. brought back
C. brought forward
D. brought in
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