【題目】In summer, food goes bad easily _____ it is put in the refrigerator.
A.until
B.if
C.unless
D.since

【答案】C
【解析】句意:夏天,食物很容易壞,除非放進(jìn)冰箱里。until直到;if如果;unless除非,如果不;since自從。根據(jù)句意可知選C。

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