there are already quite a number of firms____
In our country there are already quite a number of firms ____ computer programing.
填which specializes in还是specializing in?为什么?
人气：222 ℃ 时间：2020-04-13 19:19:03
解答
specializing in
第一选项错误,如改成 which specialize in 就对了.但也没第二选项好.
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