4．---Is this your sister？
---Yes，____is．（　�。�
A．itB．heC．sheD．that

分析 --這是你的妹妹嗎？
--是的，它是．

解答 答案：A．考查指示代詞．句意"--這是你的妹妹嗎？--是的，它是．"．Is this…？這是…嗎？一般疑問句，肯定回答用Yes，it is．否定回答用No，it isn't．結(jié)合Yes，可知，答案是A．

點(diǎn)評 指示代詞既可以指人，也可以指物，要根據(jù)具體的語境進(jìn)行分析．還要熟記每個代詞的用法．

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