1．We're not sure if it     tomorrow．If it     ，we won't go hiking．（　�。�
A．will rain；rainsB．will rain；will rain
C．rains；rainsD．rains；will rain

分析 我不確定明天是否下雨，如果下雨我就不去徒步旅行了．

解答 答案：A 根據(jù)We're not sure if可知，if在動詞后面，它引導(dǎo)的是賓語從句，表示"是否"．當(dāng)主句是一般現(xiàn)在時態(tài)或含情態(tài)動詞的句子，賓語從句應(yīng)該根據(jù)需要選用任何時態(tài)．此句由tomorrow可知，用一般將來時態(tài)，排除CD；又根據(jù)If it，we won't go hiking可知，if引導(dǎo)的是條件狀語從句，當(dāng)主句是一般將來時態(tài)，從句應(yīng)該用一般現(xiàn)在時態(tài)表將來，我們稱這一現(xiàn)象為"主將從現(xiàn)"，排除B，故選A．

點評 本題考查賓語從句，做題時注意三要素時態(tài)、語序和引導(dǎo)詞，注意if引導(dǎo)的賓從和狀從的時態(tài)區(qū)分．

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