-where were you when the UFO arrived?-I was _______ the library.A.at the front of B.in front of

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-where were you when the UFO arrived?-I was _______ the library.A.at the front of B.in front of
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-where were you when the UFO arrived?-I was _______ the library.A.at the front of B.in front of
-where were you when the UFO arrived?-I was _______ the library.A.at the front of B.in front of

-where were you when the UFO arrived?-I was _______ the library.A.at the front of B.in front of
B in front of
在.前面【在范围外】
at the front of 是在某一范围内的前面

B.in front of

这四个介词短语的涵义均与“在前面”有关,但用法区别在于:
in front of通常相对于某物体的外部来说,指另外的物体或人位于该物前面,意为“在……前面”。如:
There are some trees in front of the house.房子的前面有一些树。(树在房子之外的前面)
in the front of通常相对于空间而言,指某人或物位于某个空间的内...

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这四个介词短语的涵义均与“在前面”有关,但用法区别在于:
in front of通常相对于某物体的外部来说,指另外的物体或人位于该物前面,意为“在……前面”。如:
There are some trees in front of the house.房子的前面有一些树。(树在房子之外的前面)
in the front of通常相对于空间而言,指某人或物位于某个空间的内部,但它指的是物体的前部,意为“在……的前部”。如:
The teacher is standing in the front of the classroom.老师站在教室的前面。(指教室里的前面)
at the front of也指在某个物体本身或范围之内的前部,但仅指
一个点而已,范围没有in the front of那么大。两者有时可换用。如: Mike is sitting at /in the front of the classroom.迈克坐在教室的前面。
in front单独使用,笼统地指某人或物“在前面”。如:
Now they are in front.现在他们在前面。
区别是以上这些~~~

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