问题
选择题
According to a survey, people over 60 _____ volunteered two to three hours a week had better health than
non-volunteers. [ ]
A. who
B. which
C. when
D. what
答案
答案：A
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According to a survey, people over 60 _____ volunteered two to three hours a week had better health than
non-volunteers. [ ]
A. who
B. which
C. when
D. what
答案：A