问题
选择题
He would have been a doctor 20 years ago, but he _____ to be a teacher.
A．chooses
B．chose
C．had chosen
D．has chosen
答案
B
考查虚拟语气和时态。But后面的句子要使用陈述语气，共计前半句的would have been说明本题是与过去相反的虚拟语气，故But后面要使用过去时。故B正确。
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