The children ________ many times not to swim alone in the sea before the accident happened.（　　）

A．has warned	B．had warned
C．has been warned	D．had been warned

【答案】D

【解答】

【點評】

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發(fā)布：2024/5/10 8:0:9組卷：5引用：1難度：0.5

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A．should water	B．should be watered
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1． The flowers in the garden ___________three times a week，or they'll die. （ ?。?/h2>