He has worked         the maths problem for nearly an hour but he simply can’t work it      .
On ;at           B. on ;out            C. at ;up              D. for ;out
B
考查介詞。work on從事，忙于；work out解決。句意：他已經(jīng)做那條數(shù)學(xué)問題接近1個(gè)小時(shí)了，但他還沒有做出來。
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