曼哈顿模考中一道久思不得其解的SC

GMAT400

amy14365 发表于 2017-1-4 23:10
不是的吧，加逗号怎么会表示后面是一个独立的句子呢？逗号没有这个功能吧TAT ...

Comma+and 连接两个独立句啊

I eat rice, and I drink beer.
I eat rice and drink beer.
这两个句子都是correct啊

但是 I eat rice, and drink beer 就不对了啊 因为comma and之后应该是一个独立句啊

Coco.He

BCD: modifier的主语错误，分别为population/frequency/population.
E:忘记从哪里看来的modifer原则
  两个modifer叠加使用需注意，一般为m+sentence+m。不可m+m+s or s+m+m，介词modifer可忽略
thus， the answer is A

amy14365

GMAT400 发表于 2017-1-5 14:56
Comma+and 连接两个独立句啊

I eat rice, and I drink beer.

哇，学习了！  我想错了另外一种情况！谢谢解释！！

痞子大哥樾择

GMAT400 发表于 2017-1-4 22:46
A选项后半句this species of parasite has declined for two decades, and may finally be eradicated from ...

同意，我也觉得此处逗号多余，曼哈顿讨论区上有一个老师之前做过类似总结：
The GMAT tends to (I say tends to because no one is perfect) use commas in 3 ways:
1) separate a non-essential modifier from the main sentence
2) delineate items in a 3 or more part list
3) link two independent clauses.

如果主语＋谓语1+and＋谓语2，一个主语搭配两个谓语，并非两个句子，那么and前面是不加逗号的。


I like apples, and bananas. —>incorrect
I like apples and bananas. —>correct
I finished my homework, and went out to play. —>incorrect
I finished my homework and went out to play. —>correct

examples for two independent clauses

I was doing my home work, and she was playing outside. —>correct
I was doing my home work and she was playing outside.  —>incorrect