The ruler       on the bed. It’s on the floor.
A．isB．a(chǎn)reC．notD．isn't
A

試題分析：本題的主語是the ruler 是單數(shù)，其后的be動詞應(yīng)該用is。又因為It’s on the floor.“尺子在地板上”，所以應(yīng)該用isn’t。C選項缺少be動詞，是不對的。所以本題選A.
點評：做題時首先應(yīng)該注意句子的主語，根據(jù)主語確定be動詞，然后根據(jù)題目的關(guān)鍵信息，最后選出正確答案。
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