---Why do you look so upset?
---There are so many troublesome problems ____.
A．remaining to be settledB．remained settled
C．remaining to settleD．remained to be settled
A
考察非謂語(yǔ)動(dòng)詞。根據(jù)句子結(jié)構(gòu)可知，該處為problems的定語(yǔ)，remain是系動(dòng)詞，無(wú)被動(dòng)。故排除BD. Remain的用法是sth remain to be done，
句意為，有很多麻煩的問(wèn)題留待解決。
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