单项选择题

______is well-known, the environment in China is badly in need of improve-merit.

A．It
B．That
C．As
D．What
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单项选择题
It shames me to say it, butI told a lie when______at the meeting by my boss.
A．questioning
B．having questioned
C．questioned
D．to be questioned
单项选择题
______you don't know the rule won't be a sufficient excuse for your failure.
A．It is
B．That
C．Because
D．What
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