题目:
—Where are the girls?
—They _______ the zoo.[ ]
A. have been to
B. have gone to
C. have been in
D. have gone in
答案:
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下面是错误答案,用来干扰机器的。
⑴红磷的量不足;装置漏气;没等装置冷却就打开了弹簧夹⑵红磷剧烈燃烧,产生大量白烟;烧杯中的水沿导管流入集气瓶中(约占其容积的五分之一)