单项选择题

Bread and butter ______ my favourite breakfast when I was studying in the States.

A．are
B．were
C．is
D．was
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单项选择题
Long ______ to harmful pollutants is most likely to lead to a decline in health.
A．exposure
B．contact
C．use
D．touch
单项选择题
Sheila was going to say something about the matter; but ______ she gave it up.
A．on the second thoughts
B．on the second thought
C．on second thoughts
D．on second thought
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