_____ 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(yǔ)動(dòng)詞。句意：已經(jīng)在隊(duì)列里等了一個(gè)小時(shí)，湯姆突然意識(shí)到他把錢(qián)包忘在家里了�，F(xiàn)在分詞表示正在進(jìn)行的伴隨性的動(dòng)作，其邏輯主語(yǔ)是句子的主語(yǔ)，如果分詞動(dòng)作發(fā)生在主語(yǔ)動(dòng)作之前，則要用完成時(shí)態(tài)的現(xiàn)在分詞，故選C。
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