用at the same time表示转折时,前面必须加but吗?however用在句中是前后都要用逗号隔开吗?例题:The work is really difficult,____it's very interesting.A.however B.therefore C.still D.at the same time请说明原因,

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用at the same time表示转折时,前面必须加but吗?however用在句中是前后都要用逗号隔开吗?例题:The work is really difficult,____it's very interesting.A.however B.therefore C.still D.at the same time请说明原因,
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用at the same time表示转折时,前面必须加but吗?however用在句中是前后都要用逗号隔开吗?例题:The work is really difficult,____it's very interesting.A.however B.therefore C.still D.at the same time请说明原因,
用at the same time表示转折时,前面必须加but吗?however用在句中是前后都要用逗号隔开吗?
例题:The work is really difficult,____it's very interesting.
A.however B.therefore C.still D.at the same time
请说明原因,

用at the same time表示转折时,前面必须加but吗?however用在句中是前后都要用逗号隔开吗?例题:The work is really difficult,____it's very interesting.A.however B.therefore C.still D.at the same time请说明原因,
选D.联系前后文,只有D才对.这项工作真的很难,但同时也很有趣.
at the same time不用一定加BUT的.
我记得however放在句中时后面要用“,“隔开的,放在结尾处时,前面不用”,“

选D。however如果放在句中，的确是要前后都加逗号，但是at the same time其实就可以表示【但是】的转折意思，所以不用加but的

however 后面不一定要加逗号隔开。但这个题要先看出题者的意图。因为后面那句跟前面那句有转折的关系，所以不能直接写at the same time 。则据语意应选B。
仅供参考。

B.therefore
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