We keep in touch with each other____ letters. A. in B. with C.by D. use

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We keep in touch with each other____ letters. A. in B. with C.by D. use

We keep in touch with each other____ letters. A. in B. with C.by D. use
We keep in touch with each other____ letters. A. in B. with C.by D. use

We keep in touch with each other____ letters. A. in B. with C.by D. use
C
with 后常加有形工具.
in 后常加语言,墨水,颜料
by 后加交通工具,无形的手段