单项选择题

What______ doing when you______

A．were they; got there
B．they were; arrived there
C．were they; came there
D．they were; reached there
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单项选择题
I opened a letter and it contained______
A．a important information
B．an important information
C．the important information
D．important information
单项选择题
—May I. use your pen, please—Sure.
A．Go ahead
B．Don't mention it
C．Certainly not
D．Not at all
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