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Inthepast,wehadnophones,sowehadtokeepintouch

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问题详情:

Inthepast,wehadnophones,sowehadtokeepintouch

In the past, we had no phones, so we had to keep in touch _____ writing often.

A. with            B. of               C. on               D. by

【回答】

D

知识点:介词和介词短语

题型:选择题

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