题目内容
I haven't seen Anna since she left our hometown two years ago, but we do keep in touch with each
other by sending e-mails __________.
other by sending e-mails __________.
[ ]
A. here and there
B. sooner or later
C. at one time
D. now and then
B. sooner or later
C. at one time
D. now and then
D
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