There are some new dictionaries on that shelf.They ______a few weeks ago.A.buy B.boughtC.were bought D.have bought知道选C,为什么

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There are some new dictionaries on that shelf.They ______a few weeks ago.A.buy B.boughtC.were bought D.have bought知道选C,为什么
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There are some new dictionaries on that shelf.They ______a few weeks ago.A.buy B.boughtC.were bought D.have bought知道选C,为什么
There are some new dictionaries on that shelf.They ______a few weeks ago.A.buy B.bought
C.were bought D.have bought知道选C,为什么

There are some new dictionaries on that shelf.They ______a few weeks ago.A.buy B.boughtC.were bought D.have bought知道选C,为什么
这些dictionaries是被买来的,所以是be bought.是过去几周前买的,所以是was