题目内容
His parents are ______ math teachers.
| A．each | B．all | C．every | D．both |
D
解析试题分析：句意：他父母都是数学老师。all 所有，三者或三者以上都；both 两者都；each （两个或两个以上）每个，每一；every指三者或三者以上的每个。父母指两个人，结合句意，故选D。
考点：考查代词的用法。
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