单项选择题

It's high time you（）to work on the plan for our journey to those beautiful mountains in Northern Europe.

A．start
B．would start
C．started
D．had started

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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
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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