问题
选择题
In those days, we had no phones, so we had to keep in touch ________ letters often.
A.with
B.of
C.on
D.through
答案
答案:D
题目分析:句意:在那些过去的日子,我们没有电话,因此我们不得不经常通过书信保持联系。keep in touch through表示通读…保持联系。根据句意,故选D。