18．It was 5o'clock ______ the front doorbell opened..（　�。�
A．thatB．whenC．whatD．in which

分析 五點時，前面的門鈴響了．

解答 答案：B句中the front doorbell opened不能構(gòu)成對5 o'clock的修飾或強調(diào)，不是強調(diào)句型或定語從句；it指時間，是句子的主語；the front doorbell opened在句中作時間狀語，是一個狀語從句，意思是當(dāng)前面的門鈴響時，當(dāng)時的時間是五點．故選B．

點評 時間狀語從句是副詞性從句的一種，在句中作時間狀語，修飾句子的謂語或整個句子內(nèi)容．

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