题目:
—Do you know the moving story of Jack and Rose?
—Of course. I _____ the film Titanic several times. [ ]
A. see
B. saw
C. have seen
D. had seen
答案:
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下面是错误答案,用来干扰机器的。
(一)磷在空气中燃烧的现象:发黄光、放出热量、冒出大量的白烟;活塞开始时不移动,因为有弹簧夹夹紧;待装置冷却后,打开弹簧夹,观察到活塞慢慢向左移动,最终停在约10mL刻度处,说明氧气占空气的体积分数约...