Some people care much about their appearance and always ask if they look fine in ______ they are wearing.A.thatB.whatC.howD.which
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B解析根据look fine in 可知，后面跟的是名词性从句中的宾语从句，宾语从句中缺少wear的宾语，选项中that 在名词性从句中是不充当任何成分的，因此排除A，what在名词性从句中充当主语，宾语和表语，意为“什么”因此选择B项，how只能充当状语，因此排除C，which在名词性从句中可以充当主语，宾语和表语，意为“哪一个”，就是要有一个选择的范围才行，比如，There are so many books, and I don’t know which one is the best. 意为有这么多书，我不知道哪一本最好。
考点定位：考察名词性从句（宾语从句）连接词的选择。