问题
选择题
—Mary, you bring my math book to school?
—OK, Dave. [ ]
A. can
B. are
C. do
D. is
答案
答案：A
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—Mary, you bring my math book to school?
—OK, Dave. [ ]
A. can
B. are
C. do
D. is
答案：A
，则棒质量为（）。