单项选择题

Shop assistant: Good morning. Can I help you
Customer: ______. I'm just looking round.

A．No, you can't
B．Not at the moment, thanks
C．Yes, please
D．Yes, thank you
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单项选择题
To one's boss, an employee should dress neatly, be ______ and show interest in the job.
A．instant
B．timely
C．punctual
D．quick
单项选择题
The last half of the nineteenth century ______ the steady improvement in the means of travel.
A．has witnessed
B．was witnessed
C．witnessed
D．is witnessed
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