Though he failed, he tried it again and again.A. to doB. doingC. doD. done.

发布时间：2020-08-16 11:42:24

Though he failed, he tried      it again and again.
A. to do
B. doing
C. do
D. done.

网友回答

A. to do
(答案→)B. doing
C. do
D. done.
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