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18．The person who takes no chances generally has to take is left when others are through choosing．（　　）

A．

however

B．

whatever

C．

whenever

D．

whoever

分析當別人在經歷艱難抉擇的時候不去冒險的人一般只能挑別人剩下的東西．

解答答案：B．
本句中 is left為動詞take的賓語，在該從句中缺少主語，可排除A和C，因為這兩個引導詞只能作狀語；根據句意"接受別人剩下的東西"，而不是指人，可排除D，故選B．who takes no chances為一定語從句，修飾先行詞the person；后面含有一個when引導時間狀語從句．

點評解答這類題目，關鍵在于分析清楚句子結構，知道引導詞的使用特點．通過判斷引導詞在從句中所作的成分，來選擇正確的引導詞．

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