The flight instructor, ___________ at the air base, said that ...

★ TOEFL

The flight instructor, ___________ at the air base, said that orders not to fight had been given.

A. when interviewed

B. when he interviewed

C. when his interview

D. when interviewing

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Researchers have long debated _____________ Saturn’s moon Titan contains hydrocarbon oceans and lakes.

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B. whether it

C. whether

D. whetherover