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We can easily become unhappy_____ we work out our problems in our daily life.
A.after B.if C.until D.unless
D
连词用法。句意:在日常生活中,如果我们解决不了问题,我们很容易变的不高兴。unless=if not如果不……;after在……之后;if如果;until直到……为止。故选D。
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