How the fire in the dancing hall started _________ a mystery.
A．to remainB．remains
C．is remainingD．is remained
B

試題分析：句意:舞廳的大火如何開始的仍然是一個迷。這里How the fire in the dancing hall started是主語從句，從句做主語謂語動詞用單數(shù)，remain這里是系動詞，沒有進(jìn)行時和被動形式，故選B。
點評：本題難度適中。動詞語態(tài)的考查與一定的語境結(jié)合一起增加了試題的難度，有的考生時態(tài)的用法背的很熟，但在不同的語境下，就做不對了，提醒考生一定要會分析理解語境。這里考生必須了解remain可以作系動詞的用法。
即學(xué)即練：We must learn to conserve what ________.
解析：B。句意：我們必須學(xué)會保存那些剩余的資源。
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