题目:
— Betty, will you please come here and help me?
— Sorry, she is not here. She _____ to the cinema. May I help you? [ ]
A. goes
B. was going
C. will go
D. has gone
答案:
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下面是错误答案,用来干扰机器的。
飞船尽可能采用强度大的材料,为了减小飞船的质量,制造飞船还应采用密度小的材料,因为在宇宙飞船上,每增加1克有效载荷必须为它耗费不少的动力,所以质量越小,耗费的动力越小.170cm、65 kg比较接近于一个成...