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459.Unexpected difficulties ________ in the course of their experiment.
A.arises
B.were arising
C.arose
D.were arisen
460.We're going camping tomorrow.Will you join us?
I wish I _______.As a rule,I _______my mother in the country that day of the week.
A.would;saw
B.can;have seen
C.shall;will see
D.could;see
