题目内容
11．Don't make any noise．The scientistis giving（give）a lecture to the students．分析 翻译：不要制造噪音．科学家正给学生作报告．
解答 从 Don't make any noise 可以看出后面应该是现在进行时态．因此答案是：is giving．
点评 有关时态的题目要从时间状语上分析进而联系各个时态的构成进行解答．有的句子并没有具体的时间状语，比如这个题目就是．但是Don't make any noise就能看出要用现在进行时
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