—Why do you look sad?
—There are so many problems ________.
A．remaining to settleB．remained settling
C．remaining to be settledD．remained to be settled
C
由于remain是不及物動(dòng)詞，故應(yīng)用現(xiàn)在分詞remaining，相當(dāng)于定語(yǔ)從句that remains；動(dòng)詞settle置于remain之后，應(yīng)用動(dòng)詞不定式的被動(dòng)結(jié)構(gòu)來(lái)表示動(dòng)作還未完成。
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