【題目】Some people get in touch with each other by mobile phones__________ others keep contact with each other by e-mail.

A. when B. before C. while D. since

【答案】C

【解析】考查連詞：A. when當(dāng)…時(shí)候B. before在…之前C. while當(dāng)…時(shí)候，然而，雖然，D. since既然，句意：一些人通過手機(jī)彼此聯(lián)系，然而一些人通過電子郵件聯(lián)系。選C。

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