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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