Most of the problems , he has a tight schedule every day. A. remaining unsettledB. remaine

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(答案→)A. remaining unsettled
B. remained unsettled
C. remaining unsettling
D. remained unsettling
解析：本题考查非谓语动词。问题the problems与unsettle之间是主谓关系，不是被动的关系，所以选动词ing形式。句意：很多问题停留着还没解决，他每天都有一个很紧张的时间表。