题目内容
Gun control is a subject _____ Americans have argued for a long time.
[ ]
A. of which
B. with which
C. about which
D. into which
B. with which
C. about which
D. into which
C
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Gun control is a subject ________Americans have argued for a long time,
| A．of which | B．with which | C．into which | D．about which |