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
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

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.