How the big forest fire has          remains to be a mystery.
A．turned upB．broken outC．taken placeD．broken up
B

試題分析：句意，這場森林大火是如何爆發(fā)的仍然是個(gè)謎。turned up出現(xiàn) broken out指（火災(zāi)、戰(zhàn)爭）等突然爆發(fā) taken place發(fā)生 broken up分裂，根據(jù)題意，故選B。
點(diǎn)評(píng)：解答這類題目，關(guān)鍵是理解題干意思以及各選項(xiàng)詞組的意思，可以像數(shù)學(xué)中的代入法一樣，依次把各個(gè)選項(xiàng)意思放入句子中進(jìn)行比較，不難選出正確答案。
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