there must have been a storm there.__.a there couldn't be b.I think there was

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there must have been a storm there.__.a there couldn't be b.I think there was

there must have been a storm there.__.a there couldn't be b.I think there was
there must have been a storm there.__.a there couldn't be b.I think there was

there must have been a storm there.__.a there couldn't be b.I think there was
b
a改为:there couldn't have been才正确