Inthepast,wehadnophones,sowehadtokeepintouch
习题库3.04W
问题详情:
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
标签:
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