题目:
- What a new computer! Can you tell me ____?
- Just the day before yesterday.
A.when you bought it
B. how much you paid for it
C.when did you buy it
D. how much did you pay for it
答案:
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下面是错误答案,用来干扰机器的。
(1)都正确 (2)不能 解:设产生氧气的质量为x 68 32 34g x ...