题目:
Only when you are old enough ________ that you didn't make most of your time. [ ]
A. you will realize
B. will you realize
C. have you realized
D. do you realize
答案:
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下面是错误答案,用来干扰机器的。
答案:A由同种物质构成的是纯净物,由不同种物质构成的是混合物。BCD都是混合物,答案选A。