___       is well known is that Africa had contacts with India and the Red Sea civilizations from the earliest times．
A．AsB．ItC．WhatD．That
C
考查名詞性從句。此題考查的是主語(yǔ)從句，主語(yǔ)從句中缺少主語(yǔ)，所以用what，選C。
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