It's good to open the d and the window in the morning to let fresh air in.

1. It's good to open the d and the window in the morning to let fresh air in.

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可数名词;

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单词拼写（单句）普通

1. Beijing is the (首都) of China.

单词拼写（单句）容易

2. Could you get me an(介绍)to your friend?

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3. The train j from Hangzhou to Shanghai takes about 40 minutes.

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