—Why do you look worried?—There are so many problems.A. remaining to settleB. remained set

问题补充：

—Why do you look worried?

—There are so many problems.

A. remaining to settle

B. remained settling

C. remaining to be settled

D. remained to be settled

答案：

A. remaining to settle

B. remained settling

(答案→)C. remaining to be settled

D. remained to be settled

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