_____ life exists on any other planet in the solar system still remains a question.
A．WhyB．Whether C．How D．Where
B

試題分析：考查主語從句：句意：是否在太陽系的其他星球上有生命的存在還是個問題。通過句意判斷應(yīng)該是whether連接主語從句，選B。
點評：如果主語從句缺少主賓表，用what連接主語從句，如果不缺成分，用that連接，引導(dǎo)主語從句的that在從句中不做成分，只起到連接的作用，學(xué)生要會分析句子成分。表語從句也是這樣。
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