The computer system____ suddenly while he was searching for information on the Internet.
A．broke downB．broke outC．broke upD．broke in
A
考查短語動詞意義區(qū)別。Break down“出毛病，失��；分解”；break out “突然發(fā)生，爆發(fā)”; break up “驅(qū)散，分解”; break in “闖入；插話”.根據(jù)題意：當(dāng)他正在因特網(wǎng)上搜尋信息時，電腦系統(tǒng)突然出現(xiàn)了故障。可知答案為A.
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