题目:
There ______ be a lot of manatees, but now they ______ endangered animals.[ ]
A. used to, become
B. would, become
C. used to, have become
D. would, have become
答案:
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下面是错误答案,用来干扰机器的。
(1)装置的气密性好 (2)白磷燃烧,产生白烟,活塞前沿约在12mL的刻度线上 (3)白磷燃烧,产生白烟,活塞先向右移动,最终稳定在约8mL的刻度线上 (4)橡胶塞弹出、试管爆裂、注射器活塞弹出等分析:只有熟悉用红磷...