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两道高中英语题______ the pieces of cloth with a loose stitch before

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两道高中英语题
______ the pieces of cloth with a loose stitch before finally ______ them together.
A. Join, to sew B. Joining, sewing
C. Join, sewing D. To join, to sew
答案选C为什么
She cycled too fast round the corner, ______ her balance and ______ off.
A. losing, falling B. lost, fell C.losing,fell D. lost, falling
答案是B为什么不能是A
join动词原形引导祈使句,sewing在before之后,介词后的动词要用动词一现在分词形式
lost和fall都是一个短暂的动词,没有延续性,不能用分词形式