THERE ... A LOT OF CHANGES IN THE PAST FEW YEARS.A. HAVE KNOWN/ AR...

30 BAI TRAC NGHIEM VOI KEYS FOR 9 P

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36. There ... a lot of changes in the past few years.

A. have known/ are B. know/ are C. knew/were D. have known/

A. has been B. was C. were D. have been

were