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. favored
D. transmitted
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单项选择题
Which of the following can't be used to fill in the blank in the sentence I'll ______ him from going swimming alone
A. stop
B. prevent
C. keep
D. forbid
单项选择题
At no time ______ other countries.
A. China will invade
B. will invade China
C. will China invade
D. invade will China
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