问题
选择题
—May I come in?
—Come in, please. But could you please tell me ____? [ ]
A. why you're late again
B. what were you doing then
C. who you talked
D. how do you come to school
答案
答案：A
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是某公司生产的一种新型除草剂，比原有除草剂大大提高了除草效率，关于这种物质的叙述中正确的是（ ）