North Carolina's outer banks are a chain of low, narrow ...

★ TOEFL

North Carolina’s outer banks are a chain of low, narrow islands ___________ the mainland from the frequent Atlantic storms in the area.

A. they buffer

B. that buffer

C. to buffer them

D. that they buffer

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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