When traveling alone in the mountains, you’d better take a _______ with you in case you get lost.

单选题

When traveling alone in the mountains, you’d better take a _______ with you in case you get lost.

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单选题

_____ out alone when it is late at night.(　　)

答案解析

填空题

alone（）

答案解析

问答题

when

答案解析

单选题

When she was alone at home, Mary needed a friend _____.

答案解析