单项选择题

No one has ______ been able to know who she is.

A．still
B．yet
C．already
D．just
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单项选择题
—Could you put on your earphone — ______ . Is it disturbing you
A．Take it easy
B．I'm sorry
C．Not a bit
D．It depends
单项选择题
When ______ difficult problems, we should often take an optimistic attitude.
A．faced
B．being faced
C．facing
D．having faced
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