--- __________ did Charles Smith hiccup?  --- For about two weeks.
A．WhenB．HowC．How longD．How often
C
疑問詞辨析。When什么時候；How怎樣；How long多長；How often多久一次。根據(jù)答語，大約兩周。可知前文提問時間長短，故選C。
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