单项选择题

From the writer's observation, we can see that fires break out in Tokyo ______.

A．occasionally
B．quite frequently
C．net very often
D．twice a day
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单项选择题
What does the writer say about the Japanese trains ______
A．They are very nice and comfortable.
B．There are not enough trains.
C．They often run behind schedule.
D．They leave and arrive at the right time.
单项选择题
The classroom needs ______.
A．clean
B．B ) to clean
C．cleaning
D．being cleaned
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