Question

His father and mother ____ teacher

His father and mother ____ teachers. A．are all B．are both C．both are D．all are

Answer 1

B

试题分析： both常放在be动词之后, 表示“两者都是……”。all指“三者或三者以上都是……”，句意：他的爸爸和妈妈都是老师，故选B。