单项选择题

Our kitchen is a mess. We （）any cleaning for weeks.

A. didn't do
B. haven't been doing
C. don't do
D. haven't done

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This is one of the most beautiful pictures of scenery that（） displayed here.

A. is
B. are
C. has been
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A number is an abstraction （） no physical existence.

A. has
B. to have
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