问题
选择题
It ____ Jack twenty minutes ____ the math problem yesterday.
A．took; to work out
B．takes; worked out
C．has taken; work out
D．is taking; working out
答案
答案：A
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It ____ Jack twenty minutes ____ the math problem yesterday.
A．took; to work out
B．takes; worked out
C．has taken; work out
D．is taking; working out
答案：A