When I entered the classroom I found the students ______ the questions in groups.A.to dis
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When I entered the classroom, I found the students ______ the questions in groups.
A.to discuss
B.discuss
C.discussed
D.discussing
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参考答案。A项“to discuss”是动词不定式;B项“discuss”是动词原形,而C项“discussed”是动词的过去分词,都不能作动词find的宾语补足语,故都排除。
