问题标题:
____inthequeueforhalfanhour,Tomsuddenlyrealizedthathehadlefthiswalletathomea:Towaitb:Havewaitedc:Havingwaitedd:Tohavewaited
问题描述:

____inthequeueforhalfanhour,Tomsuddenlyrealizedthathehadlefthiswalletathome

a:Towait

b:Havewaited

c:Havingwaited

d:Tohavewaited

邱卫斌回答:
  C   wait的行为也是由Tom做得,并且两个动作是同时发生的.所以用进行时态的分词.
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