单项选择题

He (comprehends) the theory of relativity.

A．learns
B．teaches
C．understands
D．investigates .
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单项选择题
Grandfather would (stay up) till small hours reading.
A．sit up
B．sit in
C．sit on
D．sit through
单项选择题
The ice cream can be bought in_________.
The ice cream can be bought in_________.
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