单项选择题
We
on it for many hours but we have not yet reached any conclusion.
A．work
B．have been worked
C．have been working
D．are working
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单项选择题
My boss asked me to answer the phone, to take all messages, and some letters.
A．to type
B．typing
C．type
D．typewrite
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单项选择题
, such problems concerning environment protection are not as easy to solve as they look.
A．Speak generally
B．To speak generally
C．Generally speaking
D．General speaking
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