问题
选择题
It is known to us all E-mail is______ efficient than sending a fax.
A．much
B．many
C．more much
D．much more
答案
答案：D
考查比较级。句意“众所周知，电子邮件比传真的效率更高。”根据than可知，应该用比较级，efficient是多音节形容词，比较级借助于more，much可以修饰比较级more。故选D。