--I hear that a lot of scientific equipment has been bought

--I hear that a lot of scientific equipment has been bought in our school
--How wonderful!Do you know when_____?
A it has been bought B had it been bought
C it was bought D was it bought
原因?其他三个答案为什么不能选?

r33eere 1年前已收到7个回答举报

兰色晶晶幼苗

共回答了19个问题采纳率：84.2% 举报

c,社么时候买的,buy是个一次性动词.
因为有个when,问的是什么时候买的,就是买这个动作什么时候发生的,所以用一般过去时态,而do you know when .后面要用陈述句的顺序.

1年前

rr器资讯幼苗

共回答了1592个问题举报

C
Do you know放在前面,后面的疑问词"when"引导的从句顺序要用陈述句式.排除B,D.
已经买了科学仪器,提问"你知道是什么时候买的吗"
只是询问买仪器这件事的时间,所以用过去时就可以了.

1年前

woodspaulwang 幼苗

共回答了110个问题举报

1年前

bidrcupcue 幼苗

共回答了57个问题举报

A it has been bought
首先BD排除，因为此句需要的是陈述句
然后C排除，因为根据问句 has been bought in our school
所以选A

1年前

南瓜_爱幼苗

共回答了7个问题举报

因为这里的从句要用陈述语序,所以BD不对;
另外,这里用when引导的时间状语从句要用一般过去时,所以选A.

1年前

凉拌沙拉幼苗

共回答了141个问题举报

选C,因为buy是瞬间动词,
是问"什么时候买的?"
比如,你这只猫是什么时候（被）买的？
when did you buy this cat?
when was the cat bought?

1年前

FRAME119 幼苗

共回答了24个问题举报

A,应为问题上也是这个tense

1年前

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