He would have been a doctor 20 years ago, but he _____ to be a teacher.
A．choosesB．choseC．had chosenD．has chosen
B
考查虛擬語(yǔ)氣和時(shí)態(tài)。But后面的句子要使用陳述語(yǔ)氣，共計(jì)前半句的would have been說(shuō)明本題是與過(guò)去相反的虛擬語(yǔ)氣，故But后面要使用過(guò)去時(shí)。故B正確。
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