【題目】It's difficult ________ people ________ earthquakes.
A.warn; about
B.warn; for
C.to warn; about
D.to warn; for

【答案】C
【解析】句意:對于地震人們很難預(yù)測。It's+adj.+to do sth.“做某事是……的”;warn...about...“提醒……注意……”,根據(jù)句意, 選C。

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