A. | Because | B. | While | C. | When | D. | Unless |
分析 雖然克隆人類胚胎是違法的,但一些科學(xué)家已經(jīng)在努力推進(jìn)研究,為了制造克隆的人類嬰兒.
解答 答案B.考查讓步狀語從句.根據(jù)句意,此處用表示"雖然…但是"的連詞.while可引導(dǎo)讓步狀語從句,意為"雖然…但是".while引導(dǎo)時(shí)間狀語從句時(shí),意為"當(dāng)…時(shí)".when當(dāng)…時(shí)候,引導(dǎo)時(shí)間狀語從句.since引導(dǎo)原因狀語從句,意為"因?yàn),由?,引導(dǎo)時(shí)間狀語從句,意為"自…時(shí)起".if only為"但愿".
點(diǎn)評(píng) 考查從句連詞時(shí)要弄清連詞本身的含義,做題時(shí)一定要根據(jù)上下文的邏輯關(guān)系選擇.
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