Though he failed, he tried _______ it again and again.A．to doB．doingC．doD．done._刷题宝

题干

Though he failed, he tried _______ it again and again.

A．to do

B．doing

C．do

D．done.

上一题下一题 0.64难度单项选择更新时间:2010-06-18 10:17:20

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