Responde con la que completé mejor estas oraciones:

The prisioner ____ escape last night,. because it was verry difficult

a) was able to

b) were able to

c) wasn't able to

d) weren't able to



the student ______ understand English perfectly last year, but she can't now


a) was able to

b) were able to

c) wasn't able to

d) weren't able to


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