问题补充:
Mr. Green works in office, but his sister works a farm.
A.a, in B.an, in C.an, on
答案:
解析:in在里面;on在上面。句意:格林先生在一个办公室工作,但是他的妹妹在农场上工作。Office词首音素是元音,故不定冠词用an,故选C。
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