Despite the great difficulty we had out the plan it paid off in the end.A. carryingB. ca

问题补充：

Despite the great difficulty we had out the plan, it paid off in the end.

A. carrying

B. carried

C. to carry

D. carry

答案：

A. carrying

B. carried

C. to carry

D. carry

解析：句意：虽然我们实施计划的时候很难，但是最后是有回报的。分析句子可知the great difficulty是先行词，后面是省略关系代词的定语从句，在定语从句中the great difficulty做宾语，所以用的是词组：have the great difficulty （in） doing，这里省略了in，所以选A。