________ we deal with our problems, we can easily become unhappy.
A．UntilB．If
C．Unless D．Though
C

試題分析：句意:如果我們不能解決我們的問題，我們就可能很容易變得不開心。until 直到…時候，引導(dǎo)時間狀語從句；if 如果，引導(dǎo)條件狀語從句；unless如果不，除非，引導(dǎo)條件狀語從句；though雖然，盡管，引導(dǎo)讓步狀語從句。根據(jù)句意可知選C。
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