问题
选择题
Though the math problem is very difficult, the smart boy ______ it ______at last. [ ]
A. looked; out
B. worked; out
C. thought; of
D. put; up
答案
答案：B
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Though the math problem is very difficult, the smart boy ______ it ______at last. [ ]
A. looked; out
B. worked; out
C. thought; of
D. put; up
答案：B