单项选择题

At first, the speaker was referring to the problem of pollution in the country, but halfway in her speech, she suddenly ______ to another subject.

A．committed
B．switched
C．favoured
D．transferred
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单项选择题
She was so ______ in her job that she didn' t hear anybody knocking at the door.
A．attracted
B．absorbed
C．drawn
D．concentrated
单项选择题
Despite the wonderful acting and well-developed plot the ______ movie could not hold tour attention.
A．three-hours
B．three-hour
C．three-hours'
D．three-hour' s
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