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2．-Do you know if she _______  to visit us？
-I think she will come if she ________ free tomorrow．（　�。�
A．comes； isB．will come； is
C．comes； will beD．will come； will be

分析 --你知道她是否會來看望我們嗎？
--我認為如果她明天有空，她會來的．

解答 答案：B
此題考查if引導的從句：if意為"是否"引導賓語從句，if意為"如果"，引導條件轉語從句；
根據題干句意知第一個if為"是否"之意，故符合賓語從句時態(tài)規(guī)則，主句Do you know為一般現(xiàn)在時，從句可根據自身情況選擇，根據答語知她來看望是發(fā)生在將來的事，故應用一般將來時，will come；
第二個if意為"如果"故采用條件狀語從句：主將從現(xiàn)，if所在為從句，使用一般現(xiàn)在時，且主語為第三人稱單數she，故填is．故選B．

點評 此題重在考查if引導的賓語從句和條件狀語從句．考生需根據句意明確判斷詞意，再根據不同的從句采用不同的時態(tài)．

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