_________ is well known to the peasants,pests continue to eat crops, damage.?
A．It;causing　B．As;caused
C．It;causedD．As;causing?
D?
首先考查as引導的非限制性定語從句,意為“正如農(nóng)民們所知”,如用 “it” 則為“It’s known to sb.that...”；其次考查非謂語動詞。cause與pests之間存在著主動關(guān)系,因此用causing。
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