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题型：单选题题类：真题难易度：普通

—Many people talk about "Didi". I really wonder ______.

—You call to order a taxi through it on your mobile phone easily.

A、how can I use them B、who uses them most C、what they are used for

举一反三

—Can you tell me____________?
— You can take No.16 bus.

—Could you tell me _______ it takes to go from here to Harbin by car?
—About fifty minutes.

My American friend Millie is quite interested in Nanjing. She wonders _______.

No one doubted the Germans win the 2018 World Cup again.

我想知道这对年轻的夫妇结婚多久了。

我们正在讨论快餐为什么有害健康.

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