The Smiths sending e-mails letters because it is faster.
A. prefer; to writing
B. prefer; to write
C. prefers; to writing
D. prefers; to write
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(答案→)A. prefer; to writing
B. prefer; to write
C. prefers; to writing
D. prefers; to write
解析：考查固定短语。这里是prefer doing sth to doing sth.而这里是The Smiths作主语，故用prefer .