问题
选择题
Tom and David are both my good friends. David seems very serious, _____ Tom has a good sense of humor.[ ]
A. when
B. where
C. which
D. while
答案
答案：D
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Tom and David are both my good friends. David seems very serious, _____ Tom has a good sense of humor.[ ]
A. when
B. where
C. which
D. while
答案：D