问题
选择题
I have worked with him for some time and have found that he is ________ than John.
A．more efficiently a worker
B．a more efficient worker
C．more an efficient worker
D．a worker more efficiently
答案
答案：B
考查了在含有than的比较级中名词的位置，即a/an＋比较级＋名词。
造成的急性牙周炎