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
单项选择题
She ought to stop work; she has a headache because she too long.
A．has been reading
B．is reading
C．had read
D．read
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