■Have the problems they have_____ been solved.

■Have the problems they have_____ been solved.
A concentrated B,concentrating C concentrated on D.concentrating on

七月的蓝天 1年前已收到4个回答举报

nrcvl 幼苗

共回答了16个问题采纳率：87.5% 举报

选C.concentrated on,专心于..
肯定句:The problems they have concentrated on have been solved.

1年前

雨夜桂花幼苗

共回答了220个问题举报

C
concentrate on 集中力量做某事
Have the problems they have_____ been solved。（they have修饰the problems ）

1年前

zhanjiang163 幼苗

共回答了68个问题举报

C concentrated on

1年前

miaojie 幼苗

共回答了54个问题举报

C 这里应该是一个问句吧意思是：
他们专心于的问题解决了吗？
concentrate on 是一个固定搭配，on 不能省略

1年前

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