单项选择题

（）in 1943（）the harmful smog made its appearance in Los Angeles.

A．Only... that
B．It was... then
C．That it was ... when
D．It was ... that

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If it too much trouble I'd love a cup of tea（）

A．isn't
B．wasn't
C．weren't
D．hadn't been
单项选择题
Go straight into the cave and find out what's in there,（）

A．don't you
B．do you
C．will you
D．can you
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