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The telephone,_____was invented by Alexander Graham Bell.
A.as is known by us        B.which we know   C.as we know it            D.as we know。老師給的答案是C，解釋是as we know it是一個(gè)方式狀語(yǔ)從句，但我不知道為什么其他三個(gè)選項(xiàng)是錯(cuò)的或者是不恰當(dāng)?shù)�，�?qǐng)老師解惑，謝謝！

此題的逗號(hào)究竟在哪兒？

The telephone，_____，was invented by Alexander Graham Bell.
A.as is known by us        B.which we know   C.as we know it            D.as we know

上空選D為妥，AS引導(dǎo)非限定性定語(yǔ)從句。

The telephone_____was invented by Alexander Graham Bell.
A.as is known by us        B.which we know   C.as we know it            D.as we know

此空選C為妥，AS引導(dǎo)方式狀語(yǔ)從句。

原題只有The telephone后有一個(gè)逗號(hào)，請(qǐng)問(wèn)選哪個(gè)恰當(dāng)？為什么其他三個(gè)不恰當(dāng)？請(qǐng)“qinjianyu”解釋一下，謝謝你！

以此為例：

The telephone，_____，was invented by Alexander Graham Bell.
A.as is known by us        B.which we know   C.as we know it            D.as we know

A.因?yàn)閗now通常不用于被動(dòng)語(yǔ)態(tài)，所以其中介詞BY有問(wèn)題，如果換成as is known to us或者as is known都正確。

B.which代替整個(gè)主句習(xí)慣上應(yīng)放在句未，故其正確形式：The telephone was invented by Alexander Graham Bell,which we know.

C.as we know it是對(duì)as前面的名詞的限定，一般不用逗號(hào)隔開(kāi)，故不妥。

以上是個(gè)人見(jiàn)解，希望能夠幫到你。