单项选择题

Since the middle of this century ______ has been learned about space than in all human history before that time.

A．much
B．more
C．better
D．a lot
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Shanghai is a big city. It is ______the southeast of China.
A．in
B．at
C．on
D．to
单项选择题
Laura had a good reason ______ to class yesterday.
A．for going not
B．to not go
C．for not going
D．to go not
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