问题

I decided ________ at least once a week.
A:exercise
B:exercised
C:to exercise
D:exercising;
B:exercised
C:to exercise
D:exercising;
正确答案是:
同类题型
don’t want to express any opinions on the plan until it has been _________.
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The best idea____he came up with was to set up an English learning group.