单项选择题

I catch cold now and then.

A. always
B. occasionally
C. constantly
D. regularly
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单项选择题
When doves are about two weeks old, they are covered with grey feathers and are ready to try their wings.
A. grow
B. wrap
C. hide
D. test
单项选择题
A small number of firms have stopped trading.
A. hotels
B. shops
C. restaurants
D. companies
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