The rivers will become dirtier and dirtier ______ we take action to protect them
题型:不详难度:来源:
The rivers will become dirtier and dirtier ______ we take action to protect them.A.since | B.if | C.until | D.unless |
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答案
D |
解析
since由于,自从……以来;if 是否,如果; until直到;unless除非,如果不。句意:如果我们不采取措施保护他们,这些河流会越来越脏。结合语境可知选D。 |
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