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they ------teachers.a.both are b.are both

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they ------teachers.a.both are b.are both
they ------teachers.a.both are b.are both
应该选b.They are both teachers.这是固定用法.
再问: each of the 3 girls -----(study)well
再答: studies ‘each’指3个女孩中的每一个,用单数。
再问: 3q early man-----(eat)raw meat before they----(know)how to use fire
再答: ate; hadn't known 句意:早期的人类在不知道如何使用火之前吃生肉。
再问: 谢了 ben----- (see)them -----(run) when he-----(walk) home
再答: saw; running; was walikng see sb. doing sth.