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?

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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?

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.

yes.

因为是there are,所以只能用复数,所以是which specialize in.第二个选项是正确的