I'm happy ________________ you are happy.
A.  if   B. unless  C. as long as
C
同樣是引導條件狀語從句，if強調(diào)的是“兩種可能性”，如果這樣，就會怎樣；如果那樣，就會怎樣。unless相當于if not,如果不。as long as經(jīng)常用來表示說話者的愿望，只有它符合題意，表示：你快樂，我才快樂；表達了我希望你快樂的意愿。
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