He missed the early bus this morning .That was ______he was late for school.
A.why                B.because               C.if
A

試題分析：句意為：他誤了今天早上的早班車，這是他為什么上學(xué)遲到的原因。why：是……的原因，                because：因為，回答why提出的問題，if：如果，表示假設(shè)。根據(jù)語境可知應(yīng)選A。
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