We can easily become unhappy_____ we work out our problems in our daily life.
A．a(chǎn)fter B．if C．until D．unless
D
連詞用法。句意：在日常生活中，如果我們解決不了問題，我們很容易變的不高興。unless＝if not如果不……；after在……之后；if如果；until直到……為止。故選D。
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