13． --Hi Lydia． Are you going to the concert on Friday? - -I’d like to. But there are so

问题补充：

13． --Hi, Lydia． Are you going to the concert on Friday?

- -I’d like to. But there are so many problems .

A. remaining to be settled

B. remained settling

C. remaining to settle

D. remained to be settled

答案：

(答案→)A. remaining to be settled

B. remained settling

C. remaining to settle

D. remained to be settled

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