13. The rivers will become dirtier and dirtier

we take action to protect them.

   A. since   B. if   C. until   D. unless 16

13. D考查連詞辨析。

since自從;if如果;until 直到 為止；unless 除非(=if not)

句意：如果我們不采取措施保護(hù)河流，它們 將變得越來越臟。故選   D

題目來源：2016世紀(jì)金榜初中全程復(fù)習(xí)方略英語講解案 > 45分鐘課時檢測練

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