he bought many things his stay in Beijing.A,during B,when C,while D,as为什么是his,而不用he在告诉我什么情况下用 during,when while as

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he bought many things his stay in Beijing.
A,during B,when C,while D,as
为什么是his,而不用he
在告诉我什么情况下用 during,when while as

答案是A.during
one's stay in a place 是固定表达,没有为什么.类似的表达还有:I'm sorry for my coming late.另外有些情形是用 one doing sth.如 Do you mind me opening the door?
during是介词,后面跟名词或名词短语.
when while as 都是连词,后面跟句子.