[ Grammar ]
Helen travels to her office ………. foot every morning.
A. on
B. in
C. by
D. with

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. Which sentence uses the past perfect continuous? a) I had been waiting for an hour. b) I waited for an hour.
A. I will wait for an hour.
B. I was waiting for an hour.
C. I have been waiting for an hour.
D. I had been waiting for an hour.