15．The Williams moved to a safer area and since then they ______ back to their past life．（　　）
A．hadn't lookedB．didn'tlookC．wouldn't lookD．haven't looked

分析 威廉姆斯一家人搬到了一個更加安全的地方，而且自那以后他們再未回頭看他們過去的生活．

解答 答案：D
解析：A：過去完成時；B：一般過去時；C：過去將來時；D：現(xiàn)在完成時．根據(jù)橫線前面的"自從那以后（一直到現(xiàn)在）"可知本題該使用現(xiàn)在完成時（表示從過去某一時間點發(fā)生的動作一直持續(xù)到現(xiàn)在），因此結(jié)合所給選項分析可知本題答案為D選項．

點評 本題考查時態(tài)，做此類題題目時一定要仔細分析句子結(jié)構(gòu)并結(jié)合句意確定句子所需時態(tài)；再結(jié)合選項分析及其它要求選出最終答案．

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