单项选择题
There is a computer system ______ the company is experiencing problems.
A．with which
B．as which
C．such as
D．for such
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单项选择题
They talked and talked as if they ______ never meet again.
A．will
B．would
C．should
D．shall
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单项选择题
______more careful, such spelling mistakes might have been avoided.
A．You had been
B．You have been
C．Had you been
D．Have you been
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