问题描述：
I stopped to listen,and my son seemed _________ himself _________ in the living room.A.to enjoy,
I stopped to listen,and my son seemed _________ himself _________ in the living room.
A.to enjoy,to shut B.to be enjoying,shutting
C.to be enjoying,shut D.to have enjoyed,having shut
为什么选C
I stopped to listen,and my son seemed _________ himself _________ in the living room.
A.to enjoy,to shut B.to be enjoying,shutting
C.to be enjoying,shut D.to have enjoyed,having shut
为什么选C
问题解答：
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