这个不定冠词的用法正确吗?(a topic for an interesting research paper)Can you think of an idea for (a) topic for an interesting research paper?上句中,a topic 是否应该修正为 the topic (for an interesting research paper)?还有

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这个不定冠词的用法正确吗?(a topic for an interesting research paper)Can you think of an idea for (a) topic for an interesting research paper?上句中,a topic 是否应该修正为 the topic (for an interesting research paper)?还有
这个不定冠词的用法正确吗?(a topic for an interesting research paper)
Can you think of an idea for (a) topic for an interesting research paper?
上句中,a topic 是否应该修正为 the topic (for an interesting research paper)?
还有这句:After the man standing over there was punched in the nose,he suffered (a) bloody nose.
是否应该改成 (the) bloody nose?

这个不定冠词的用法正确吗?(a topic for an interesting research paper)Can you think of an idea for (a) topic for an interesting research paper?上句中,a topic 是否应该修正为 the topic (for an interesting research paper)?还有
用a是正确的,因为所谈论的不确定,任意的一个topic就可以
同理,第二句bloody nose不是特指,不能用the

我认为用a是正确的。因为双方在谈论的RESEARCH PAPER并不是确定的。

第一句对,

第一个改的对,第二个不用改