When you study in the United States, usually you have to buy your own health _______.

单选题

When you study in the United States, usually you have to buy your own health _______.

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单选题

When can you go to aerobics class in “New You”?

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单选题

When he was in his he began to study English.

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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

Thank you for your letter of May 6th, in which you _______ about the bicycles of Model 897.

答案解析