问题描述：
Jr.Parkinson stood up and left the room,____ the door behind him.
A.closing B.closed C.close D.to close
21.People are living in ___ world where mouse clicks rule our life,so online searches have become _____ must.
A.the; / B./; a C.a; a D.a; the
A.closing B.closed C.close D.to close
21.People are living in ___ world where mouse clicks rule our life,so online searches have become _____ must.
A.the; / B./; a C.a; a D.a; the
问题解答：
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