—I think it’s very dangerous to drive six hours without a rest.
—I agree. Six hours           really a very long time.
A．hasB．isC．wereD．a(chǎn)m
B

試題分析：根據(jù)題干可知本句的意思應(yīng)該是“六小時真的是很長的一段時間�！倍鴋as表示“有”，所以應(yīng)該排除；通過意思，我們知道，此句是一般現(xiàn)在時，所以C是錯誤的；am用于I之后，所以D也是不對的。另外，當(dāng)時間作主語是謂語動詞要用單數(shù)。所以本題選B。
點(diǎn)評：在做本題時，應(yīng)注意當(dāng)時間作主語時，謂語動詞應(yīng)該用單數(shù)；另外，還應(yīng)注意句子的時態(tài)問題。
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