Due to the heavy rain and flooding，ten million people have been forced their homesA. le

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A. leaving
B. to leave
C. to be left
D. being left
解析：　　此处为force people to leave their homes的被动形式。
　　以下动词后跟不定式做宾语补足语：want，wish，ask，tell，order，beg，allow，permit，advise，persuade，cause，force，warn，invite，urge，encourage，prepare，remind，mand等。