21、I feel upset，for there are so many troublesome problems         .

    A. remaining to settle         B. remained to settle

    C. remaining to be settled   D. remained to be settled

21、C

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科目：高中英語(yǔ) 來(lái)源： 題型：

I feel upset，for there are so many troublesome problems         .

    A. remaining to settle         B. remained to settle

    C. remaining to be settled   D. remained to be settled

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科目：高中英語(yǔ) 來(lái)源： 題型：

I feel upset，for there are so many troublesome problems         ．

A．remaining to settle                          B．remained to settle

C．remaining to be settled                       D．remained to be settled

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