Question

I really can't understand such a beautiful girl like her_______ be so rude.

Answer 1

第一题答案选C。这一题是对情态动词的考法。这题的语境是;我真的不明白像她这样漂亮的女孩居然会如此粗鲁。四个选项中would能表现这样居然的语气。Usage Note:
Would is a modal verb. It is used with the base form of a verb. In spoken English, would is often abbreviated to 'd.

would是情态动词，后接动词原形，口语中常略作 &rsquo；d。

1.MODAL（表示曾经相信、希望或期待）将，将会You use would when you are saying what someone believed, hoped, or expected to happen or be the case.

No one believed he would actually kill himself...

没有人相信他真的会自杀。
第二题选C。这一题是对had better用法的考查。had better的用法和情态动词类似。had better 是“最好”的意思，可将其视为“情态”动词，可用于一切人称，没有任何词形变化。它的基本特点是：
1、其后接不带to的不定式，表示现在或将来的概念，如：
You had better sit here and have a rest. 你最好在此坐坐休息一会儿。（现在）
He had better stay in bed tomorrow. 他最好明天卧床休息。（将来）。
2、当其后接 have 加过去分词时，表示过去概念，如：
He had better have stayed in bed as I suggested. 他最好接纳我的意见卧床休息。（但他没卧床休息）
You had better have had tea,but you asked for coffee. 你最好喝茶，但却[1]你要了咖啡。
3、had better 的否定式是在其后加not，如：
You had better not say it again. 你最好不要再提那件事了。
She had better not tell lies any more. 她最好再也别撒谎了。
4. had better 的疑问句是把had提前
The doctor had better see him.
Had the doctor better see him?[2]
Who had the doctor better see?
另外had better的反问疑问句也是和情态动词一样。希望能帮上你。希望能采纳。

Answer 2

后跟动词原形 填一个助动词或情态动词 如 can
I really can't understand such a beautiful girl like her can be so rude.
我真的不明白像她如此漂亮的一个女孩会如此粗鲁。