单项选择题

If sweets ______ bad for the teeth, I will stop eating them.

A． are
B． were
C． will be
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单项选择题
After dinner Teddy cleared the table but forgot ______ the floor.
A． about cleaning
B． cleaning
C． to clean
单项选择题
Second-hand ears are ______ to buy than new ones.
A． cheap
B． cheaper
C． cheapest
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