He left the key ______ he had been an hour before.
A．whatB．thatC．whereD．which
C

試題分析：考查狀語從句。句意：他把鑰匙忘記在了一小時前他所在的地方。本句中的where he had been an hour before在句中做地點狀語，修飾動詞left the key。故C正確。
點評：首先要搞清楚狀語從句的作用，狀語從句要在句中修飾動詞或者整個謂語部分，狀語從句的考查集中在連接詞的選擇上，要和句意相結(jié)合。
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