后天就考试了,今天做Prep对这个题始终不理解,求达人讲解一下选C的原因。
In lavoratory rats, a low dose of aspirin usually suffices to block production of thromboxane, which is a substance that promotes blood clotting, but not seriously interfering with the production of prostacyclin, which prevents clotting.
C: a substance that promotes blood clotting, but does not seriously interfere
D: which is a substance that promotes blood clotting, but does not seriously interfere
concrete question?
可以先search下prep语法笔记(置顶帖有下载链接).
搜了,可是附件都是打不开。。。。。
句子结构:壮语+主句+插入语+but并列从句+定语
A选项存在以下几个问题:
1。句式不简洁
which is 应该省略。
2。but后应是与主句平行的结构。
主句为一个句子,but后也应是一个句子。but not seriously interfering,错。
C选项正确,
1。去掉了which is;
2。but后does与主句surffices对称,由于主语相同,所以but后比较从句可以省略主语。
是不是因为,如果选D的话,but does not seriously interfere 可能和which is 这个从句并列,也可能和that promotes 这个从句并列,C就只能和that promotes这个从句并列
谢谢楼上两位的讲解,我已经能够找到思路了!
加which is的话,应该是破坏了主句的平行结构。
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