happen to do和happen to be doing 的区别?顺便分别解释下.我问的是happen to be doing 不是happen to doing~

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• happen to do和happen to be doing 的区别?顺便分别解释下.我问的是happen to be doing 不是happen to doing~
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• 一道GMAT语法题Among the objects found in the excavated temple were small terra-cotta effigies left by supplicants who were either asking the goddess Bona Dee's aid （划线） in healing physical and mental ills or thanking her for such help.(划线)（A）in healing physical and mental ills or thanking her for such help(E) to heal physical and mental ills or thanking her for such help我就这两个答案搞不清楚,to do 不是表示目的嘛,求神的目的是疗伤,in healing 怎么又冒出来了.能不能帮我解释下 to do 和 in doing的区别
• 1、keep sb到底是跟doing 、to do 还是 do?或者三者都有?分别解释一下有什么不同.2、请告诉我other、another、the other和others的区别!讲得简单明了一些!最好能举个例子.3、take part in、join、sign up for之间的区别!4、of your own和by your own 以及 by yourself的区别5、try doing 和 try to do 的区别6、dead、died、death、dying的区别,及如何使用?
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