单项选择题

It' s not easy to make the dirty lake ______ again.

A. to clean
B. to be clean
C. cleanly
D. clean
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单项选择题
She can ______ a new car after saving money for a long time.
A. spend
B. cost
C. pay
D. afford
单项选择题
They are frying the potato chips in the ______ oil.
A. heated
B. heating
C. boiled
D. boiling
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