单项选择题

Three hours ought to be enough time, ______

A. oughtn' t three hours
B. didn' t they
C. shouldn' t it
D. shouldn' t three hours
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______ 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
单项选择题
John seldom got drunk, ______
A. doesn' t he
B. didn' t he
C. did he
D. does he
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