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
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单项选择题
Many ______ trees should be planted on the mountains.
A． thousand
B． thousand of
C． thousands of
单项选择题
—Who told you to clean the windows—Father. He said they are too dirty.
A． told
B． had told
C． did
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