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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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
单项选择题
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
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