Bob and David are ( ) A :in classroom B:in their classroom C:in the his classroom

Bob and David are ( ) A :in classroom B:in their classroom C:in the his classroom

题目
Bob and David are ( ) A :in classroom B:in their classroom C:in the his classroom
但A为什么不可以
答案
B:in their classroom
classroom 是单数可数名词.英语中单数可数名词前要有诸如冠词,指示代词,物主代词等限定词.
如:这是书.不可以说:This is book.
要说:This is a book
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