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In ancient times,_____the Middle East was a very rich area .

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In ancient times,_____the Middle East was a very rich area .
A such as B for example答案选B 为什么不选A呢
In ancient times,_____the Middle East was a very rich area .
for example,such as但用法有所不同.
for example作“例如”讲时,一般只以同类事物或人中的“一个”为例,作插入语,用逗号隔开,可置于句首、句中或句末.
For example,air is invisible.例如,空气是看不见的.
He,for example,is a good student.例如,他就是个好学生.
such as也作为“例如”讲,用来列举同类人或事物中的几个例子.