1.there ______ several bad accidents at this corner recently.
a. are b. have been c. were
2. the latest surgical instruments ____ during this unique operation.
a. were used b. had used c. had been used
a. are b. have been c. were
2. the latest surgical instruments ____ during this unique operation.
a. were used b. had used c. had been used
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1. have been2. were used