[ Modals and Past Tenses ]
Which sentence correctly uses the past perfect continuous tense to indicate an action of certain duration with visible results in the past?
A. They had walked in the rain.
B. They were walking in the rain.
C. They had been walking in the rain.
D. They have been walking in the rain.

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A. her
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Before he ________ to Ho Chi Minh city last night, he ________ the contract of the new album.
A. flew / signed
B. had flown / signed
C. had flown / had signed
D. flew / had signed