英文选择,条件状语从句.请简单说明.
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英文选择,条件状语从句.请简单说明.
Pure naphtha is highly explosive if ____to an open flame.
A.it exposed B.exposed C.it were exposed D expose it
Pure naphtha is highly explosive if ____to an open flame.
A.it exposed B.exposed C.it were exposed D expose it
![英文选择,条件状语从句.请简单说明.](/uploads/image/z/5544878-14-8.jpg?t=%E8%8B%B1%E6%96%87%E9%80%89%E6%8B%A9%2C%E6%9D%A1%E4%BB%B6%E7%8A%B6%E8%AF%AD%E4%BB%8E%E5%8F%A5.%E8%AF%B7%E7%AE%80%E5%8D%95%E8%AF%B4%E6%98%8E.)
B
方法一:条件状语从句可省略主谓直接以过去分词代替.本题中if it is exposed= if exposed
方法二:排除法,A中少谓语.D错误明显.C中混淆了真实条件句和虚拟条件句的区别.不用 虚拟形式,因为该句是真实条件句.
方法一:条件状语从句可省略主谓直接以过去分词代替.本题中if it is exposed= if exposed
方法二:排除法,A中少谓语.D错误明显.C中混淆了真实条件句和虚拟条件句的区别.不用 虚拟形式,因为该句是真实条件句.