I often have conversations with John over telephone, while keep in touch with Tom by__________ letter.
A.不填;;the | B.不填;a | C.the;不填 | D.the; a |
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I often have conversations with John over telephone, while keep in touch with Tom by__________ letter.
A.不填;;the | B.不填;a | C.the;不填 | D.the; a |