Pollution is a serious problem. Scientists have _______ some good ways to save it.
A．come up withB．come onC．come outD．come up
A

試題分析：句意：污染是個嚴(yán)重的問題，科學(xué)家們已經(jīng)想出了解決的辦法。A想出（注意，辦法）B繼續(xù)C出來，出版。D走上前，故選A。
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