It is known to us all E-mail is______ efficient than sending a fax.
A．muchB．manyC．more muchD．much more
D
考查比較級。句意“眾所周知，電子郵件比傳真的效率更高�！备鶕�(jù)than可知，應(yīng)該用比較級，efficient是多音節(jié)形容詞，比較級借助于more，much可以修飾比較級more。故選D。
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