单项选择题

Carelessness was the ______ of the fires.

A. reason
B. result
C. effect
D. cause
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单项选择题
Physics ______ always my strong point.
A. is
B. are
C. being
D. to be
单项选择题
He has spent a large ______ of money with no results.
A. number
B. amount
C. quality
D. quantity
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