They had already told us they _____ to carry it,so we carried for themA:won’t be able to B:can't C:couldn't D:wouldn't be able

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They had already told us they _____ to carry it,so we carried for them
A:won’t be able to
B:can't
C:couldn't
D:wouldn't be able

D
be able to,排除BC
+过去将来时,排除A

D:wouldn't be able