Amy_____,but could see nothing.She was quite frightened.A.looked careful B.look carefully C.looked at carefully D.looked carefully请说明理由,有分!

Amy_____,but could see nothing.She was quite frightened.A.looked careful B.look carefully C.looked at carefully D.looked carefully请说明理由,有分!
Amy_____,but could see nothing.She was quite frightened.
A.looked careful B.look carefully C.looked at carefully D.looked carefully
请说明理由,有分!

Amy_____,but could see nothing.She was quite frightened.A.looked careful B.look carefully C.looked at carefully D.looked carefully请说明理由,有分!
D 没有宾语,所以不加at 由后文可见是过去时,所以是looked,副词修饰动词,所以用carefully

选择A

D（could为过去式，所以look也是过去式，并且它是动词，要用副词修饰）

D 前半句是主谓结构 look 不及物动词 ，后面不跟东西， carefully副词修饰动词。看最后一句可以判断时态。

答案是D，首先你得分析一下这里look 是作实义动词，carefully 副词修饰动词，意思为仔细地看，而整体时态又是过去时，所以选D

D 从could was 判断用的是一般过去时 因此排除B ;仔细地看 需要一个副词来修饰动词看 因此用carefully 排除A ; look at 后面要加上看的对象 这里没有 因此排除D