题目内容
4. If there is a lot of work (do) ，I’m happy to just keep on until it is finished.
4. to do 由后半句"…I'm happy to just keep on until it is finished. " 可知工作还没完成，表示将来未完成的动作要用动词不定式。
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4. If there is a lot of work (do) ，I’m happy to just keep on until it is finished.
4. to do 由后半句"…I'm happy to just keep on until it is finished. " 可知工作还没完成，表示将来未完成的动作要用动词不定式。