单项选择题

No one, except his two best friends, __________ where he is.

A．know
B．knows
C．to know
D．knowing
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单项选择题
The classroom needs __________.
A．clean
B．to clean
C．to be cleaned
D．being cleaned
单项选择题
As Edison grew __________, he became more and more interested in science.
A．elder
B．the elder
C．older
D．the older
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