问题描述：
the answer is A,tellme why ,why not use B
though the plan was difficult to ___,it ___wonderfully
A carry out; worked out B be carried out ; worked out C carry out ; was worked out
though the plan was difficult to ___,it ___wonderfully
A carry out; worked out B be carried out ; worked out C carry out ; was worked out
问题解答：
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