单项选择题

The flowers （） often.

A. must be water
B. must be watered
C. must watered

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单项选择题
These walls （） stone.

A. are made of
B. made of
C. are made into
单项选择题
A new house （） at the corner of the road now.

A. is building
B. is being built
C. be building
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