this the only thing(A.that B.which C.what D.how) you most do well 选哪个

问题描述:

this the only thing(A.that B.which C.what D.how) you most do well 选哪个
理由理由!!!!!为何不选B

原句是:This is the only thing(A.that B.which C.what D.how) you most do well.
选A,定语从句中,先行词被only、very等词修饰时,关系代词不用which,而用that