12．______ from his friend for a long time，he decided to write to him again．（　　）
A．Hearing notB．Having not heard
C．Not hearingD．Not having heard

分析 好久都沒(méi)有收到他朋友的來(lái)信，他決定再次跟朋友寫信．

解答 答案：D
解析：后面主句使用的是一般過(guò)去時(shí)，而"沒(méi)有收到朋友的來(lái)信"發(fā)生在"再次寫信"之前，故前面（原因狀語(yǔ)）從句使用完成時(shí)，因此A、C選項(xiàng)直接排除．非謂語(yǔ)動(dòng)詞的否定形式是直接在非謂語(yǔ)動(dòng)詞之前加not，故B選項(xiàng)排除．綜上，本題答案為D選項(xiàng)．

點(diǎn)評(píng) 本題考查非謂語(yǔ)動(dòng)詞，做此類題目時(shí)一定要仔細(xì)分析句子結(jié)構(gòu)，確定非謂語(yǔ)動(dòng)詞的形式及時(shí)態(tài)；再結(jié)合所給選項(xiàng)選出正確答案．

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