had been puzzled over the problem for over an hour without any result
had been puzzled over the problem for over an hour without any result
I had been puzzled over the problem for over an hour without any result,________ all at once the solution flashed across my mind.
A while
B when
C then
D as
應(yīng)該選B.為什么?各個選項都講一遍為什么不對.
I had been puzzled over the problem for over an hour without any result,________ all at once the solution flashed across my mind.
A while
B when
C then
D as
應(yīng)該選B.為什么?各個選項都講一遍為什么不對.
英語人氣：788 ℃時間：2020-06-20 15:34:52
優(yōu)質(zhì)解答
我已經(jīng)對這個難題思考了一個小時還是沒有結(jié)果,正在這時答案有我的頭腦中顯現(xiàn)!when翻譯為正在這時（有突然發(fā)生的意思）,這是它的特殊用法!while ,as充當(dāng)時間狀語時只能表示一邊一邊故代入句子明顯不和理!then那時代入...
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