问题
选择题
--- __________ did Charles Smith hiccup? --- For about two weeks.
A．When
B．How
C．How long
D．How often
答案
答案：C
疑问词辨析。When什么时候；How怎样；How long多长；How often多久一次。根据答语，大约两周。可知前文提问时间长短，故选C。
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