【題目】Some animals are in danger of dying out. Therefore, effective measures must be taken________ it is too late.

A.afterB.whenC.untilD.before

【答案】D

【解析】

句意:有些動(dòng)物瀕臨滅絕。因此,必須及早采取有效措施。

考查時(shí)間狀語(yǔ)從句連接詞。after……之后,可以引導(dǎo)時(shí)間狀語(yǔ)從句;when當(dāng)……時(shí)候,可以引導(dǎo)時(shí)間狀語(yǔ)從句;until直到,可引導(dǎo)時(shí)間狀語(yǔ)從句;before……之前,可以引導(dǎo)時(shí)間狀語(yǔ)從句。根據(jù)句意,此處表示在太晚之前,before符合題意。故選D

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