We wonder ___________ quite a number of living things are dying out.
A．thatB．a(chǎn)sC．whyD．when
C

試題分析：考查賓語(yǔ)從句。句意：我想知道為什么有如此多的生物滅絕。That在賓語(yǔ)從句中不能充當(dāng)任何成分，之前連接作用；as不能引導(dǎo)賓語(yǔ)從句。When的意思不搭配。故C正確。
點(diǎn)評(píng)：賓語(yǔ)常考的考查主要是考查陳述語(yǔ)序和連詞的詞義辨析。
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