单项选择题

If you are not ______ by then, I'll take you to see the doctor.

A． good
B． fine
C． better
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单项选择题
—Where's Mary now Do you know— No, but I heard ______ in her room a few minutes ago.
A． her singing
B． her sing
C． she was singing
单项选择题
Many ______ trees should be planted on the mountains.
A． thousand
B． thousand of
C． thousands of
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