In our group,David was the first one()the homework.A finish

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In our group,David was the first one()the homework.A finish B to finish C finishing请说明原因

其实finished最好,不过你没有这个选项啊
用finished的意思是大卫是我们组（已经）完成作业的那个人.
这三个的话就选B
意思和finished不太一样,B的意思是大卫是我们组要做作业的人.
to do 表示将有做某事
C的话和finished,to finish类似,语法没问题,意思不对
表示正在.,作业要么做完,要么没做,没有正在做完
这里考察的是动词做非谓语成分,具体到这句就是动词的不定式（to do sth),动名词（doing）还有完成时（done）做定语修饰其他名词
这个时候,这个动词不是句子的谓语成分,相当于中文的 ".的" ,定语的用法基本可以参考形容词
给你个例子感受下：
She is the one to cook.她是（将）要做饭的那个人.
She is the one cooking.她是正在做饭的那个人.
She is the one cooked the dinner.她是做（了）晚饭的那个人.
再问： Now the most important thing is() the animals in danger. A protect B to protect C protecting
再答：我觉得C更合适吧
B的语法也是对的
C是陈述事实，动名词短语

B的意思有去做某事
不是去保护濒危动物，而是保护濒危动物很重要

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