单项选择题

Mary likes playing piano while David is interested in listening to music.

A． the, the
B． the,/
C． /,the

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单项选择题

The ground is covered ______ snow.

A． of
B． by
C． with

单项选择题

I have no paper with me now. Could you lend me ______

A． two pieces of papers
B． two paper
C． two pieces of paper

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