单项选择题

______ in 1943 ______ the harmful smog made its appearance in Los Angeles.

A. Only ... that
B. That it was ... when
C. It was... then
D. It was... that
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John seldom got drunk, ______
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B. didn' t he
C. did he
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I don' t think she is clever, ______
A. is she
B. do you
C. do I
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