Somepeoplewearmasksonlyincrowds,______theyexpecttocomeintocontactwithlotsofgerms.A.whichB.whenC.whereD.as
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题目内容：
Some people wear masks only in crowds,______ they expect to come into contact with lots of germs.
A.which B.when C.where D.as
优质解答
C
= in which 指在人群中
引导定语从句
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