19．Our class will go to the National Park next Sunday--________ it rains，of course．（　�。�
A．whenB．unlessC．forD．whether

分析 我們班下周日將會去國家公園．--當(dāng)然如果下雨就不去了．

解答 答案：根據(jù)it rains，of course可知如果下雨就不去了，所以答案是B unless"除非，如果不"．其他選項的含義分別是A"當(dāng)…時"；C"因為"；D"是否"．

點(diǎn)評 考查從屬連詞．unless是從屬連詞，引導(dǎo)條件狀語從句，含有否定意義，相當(dāng)于if條件狀語從句的否定形式．所以unless=if not．注意：unless引導(dǎo)的條件狀語從句和if條件狀語從句，與其它時間狀語從句一樣，用一般現(xiàn)在時代替將來時．

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