In those days, we had no phones, so we had to keep in touch ________ letters often.
A．withB．ofC．onD．through
D

試題分析：句意：在那些過去的日子，我們沒有電話，因此我們不得不經(jīng)常通過書信保持聯(lián)系。keep in touch through表示通讀…保持聯(lián)系。根據(jù)句意，故選D。
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