单项选择题

Nothing can stop us ______hard.

A． work
B． to work
C． from working
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单项选择题
______of the earth is covered by water.
A． Three-fourth
B． Three-fourths
C． Three-four
单项选择题
I think he is right, ______
A． doesn't he
B． isn't he
C． don't I
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