HE WAS SO ILL THAT HE COULD NOT _______ HIS FINAL EXAMINATION AND...
20. He was so ill that he could not _______ his final examination and cancelled
_______ a great deal in the last hundred and fifty years.
it to the next year.
a. was / have changed
b. is / change
a. make
b. do
c. take
d. gain
c. had been / will change d. has been / changed
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