单项选择题

The writer was so absorbed in her work that she didn’t notice him ________ the room.

A．enter
B．had entered
C．to enter
D．entered
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单项选择题
Nowadays, a large number of women, especially those from the countryside, ________ for the clothing industry.
A．is working
B．works
C．work
D．worked
单项选择题
I woke up with a headache, and now luckily it ________.
A．has gone
B．had gone
C．went
D．would have gone
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