You look terrible .还是You look terribly.

网友回答

是You look terrible .
look是系动词,后面接形容词.
只有实义动词（或叫行为动词）后面,或形容词前面才接副词.如：
He looks terribly grave.他脸色很严肃.
It's terribly hot here.这里热得厉害.
======以下答案可供参考======
供参考答案1:
look后面要用形容词