____in the queue for half an hour,Tom suddenly realized that he had left his wallet at homea:To waitb:Have waitedc:Having waitedd:To have waited

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____in the queue for half an hour,Tom suddenly realized that he had left his wallet at homea:To waitb:Have waitedc:Having waitedd:To have waited
____in the queue for half an hour,Tom suddenly realized that he had left his wallet at home
a:To wait
b:Have waited
c:Having waited
d:To have waited

____in the queue for half an hour,Tom suddenly realized that he had left his wallet at homea:To waitb:Have waitedc:Having waitedd:To have waited
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.