问题

_____inthequeueforhalfanhour,Tomsuddenlyrealizedthathehadlefthiswalletathome. [ ]
A:Waiting
B:Havewaited
C:Havingwaited
D:Waited
B:Havewaited
C:Havingwaited
D:Waited
正确答案是:
同类题型
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