【題目】Conservationists __________on setting aside natural reserves for the wild species they are trying to protect during the past decade.

A.focusedB.focusC.have focusedD.had focused

【答案】C

【解析】

考查時(shí)態(tài)辨析。句意:自然保護(hù)主義者在過(guò)去幾十年里一直在致力于為他們盡力保護(hù)的野生動(dòng)物物種留出自然保護(hù)區(qū)。根據(jù)during the past decade，此處應(yīng)該用現(xiàn)在完成時(shí)。故選C。

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