_______you’ve tried it, you can’t imagine how pleasant it is.
A．UnlessB．BecauseC．AlthoughD．When
A

試題分析：考查連詞：A. Unless除非B. Because因為，C. Although雖然，D. When當…時候，句意：除非你已經(jīng)嘗試過了，否則你不會想象有多么的令人舒適。選A。
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