摘要:5.If there’s a lot of work .I’m happy to just keep on until it is finished. A.to do B.to be doing C.done D.doing 解析:选A.句意:如果有很多工作要做的话.我会很高兴能留下来直到工作结束.to do可用来作a lot of work的定语.表将来.

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