单项选择题

After dinner Teddy cleared the table but forgot ______ the floor.

A． about cleaning
B． cleaning
C． to clean
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单项选择题
Second-hand ears are ______ to buy than new ones.
A． cheap
B． cheaper
C． cheapest
单项选择题
When the foreign tourist saw the Great Wall, he said ______!
A． How a Great Wall it is
B． What a Great Wall it is
C． What Great a Wall it is
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