Who do you think _ the first to come into the room to clean it?A.was B.to be C.being D.of being

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Who do you think _ the first to come into the room to clean it?A.was B.to be C.being D.of being

A.was
do you think是插入语,去掉它,就明白了:Who ( was ) the first to come into the room to clean it?

A

B.to be