I think you are supposed to listen to the teacher __as carefully as_you can还是I think you are supposed to listen to the teacher __as careful as_you can
问题描述：
I think you are supposed to listen to the teacher __as carefully as_you can
还是
I think you are supposed to listen to the teacher __as careful as_you can
答
选择carefully，这是一个副词，去掉ly的形容词。根据题意：我觉得你还是应该尽可能认真地听老师的。很显然，这里需要的是一个修饰动词listen的副词，因此选择前一个carefully。
答
that that
答
用 副词 修饰动词.
I think you are supposed to listen to the teacher __as carefully as_you can
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答
I think you are supposed to listen to the teacher __as carefully as_you can 对，因为修饰动词LISTEN TO 要用副词