This is one of the books which _______ written by Mark Twain.

问题描述:

This is one of the books which _______ written by Mark Twain.
告诉我怎么填以及先行词是什么,
还有这个题
He is the only one of the students who _________ Japanese in our class.
题上说the only one 是先行词

are 这是马克吐温写的一本书 先行词是 books