It ________ them about half an hour ________ the problem.
"A.used,todiscussB.used,discussedC.took,discussingD.took,todiscuss"...
"A. used, to discuss
B. used, discussed
C. took, discussing
D. took, to discuss" 展开
B. used, discussed
C. took, discussing
D. took, to discuss" 展开
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