People putonthesafetybeltsbeforetheplanetakesoff. ( )A．mustB．canC．mayD．ne_刷题宝

题干

People put on the safety belts before the plane takes off. ( )

A．must

B．can

C．may

D．need

上一题下一题 0.99难度选择题更新时间:2019-03-02 05:03:52

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