you practice your English every day, you won’t make any progress on it.
A．AlthoughB．UnlessC．IfD．Since
B
Unless: conj. 除非, 如果不
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u(píng)nless =" 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(shí)間狀語從句一樣，用一般現(xiàn)在時(shí)代替將來時(shí)
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