_____ in the queue for an hour,Tom suddenly realized that he had left his wallet at home.
A．To waitB．Have waitedC．Having waitedD．To have waited
C
考查非謂語動詞。句意：已經(jīng)在隊列里等了一個小時，湯姆突然意識到他把錢包忘在家里了�，F(xiàn)在分詞表示正在進行的伴隨性的動作，其邏輯主語是句子的主語，如果分詞動作發(fā)生在主語動作之前，則要用完成時態(tài)的現(xiàn)在分詞，故選C。
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