17．Even after I ______ to soil science，I sometimes wondered whether 1was doing what I wanted to do．（　�。�
A．reactedB．switchedC．adjustedD．contributed

分析 在我改學(xué)了土壤學(xué)后，我有時(shí)會(huì)懷疑我是否在做我想做的事．

解答 答案：B
react反應(yīng)；switch轉(zhuǎn)換；adjust調(diào)整；contribute作貢獻(xiàn)．句意表達(dá)的是換了專(zhuān)業(yè)，故選B．

點(diǎn)評(píng) 動(dòng)詞短語(yǔ)是一個(gè)比較難的語(yǔ)言點(diǎn)，搭配較多，用法靈活．學(xué)習(xí)時(shí)，要注意積累．尤其是相似或相近的用法，要注意區(qū)分和掌握．

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