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Read the excerpt below.



"However, this also places new demands on operators — they must learn to manage energy efficiently, closely monitor power consumption, and plan vessel speed in a more rational manner."



In the excerpt, the modal verb "must" expresses: 

Read the sentence below.



"Following the successful completion of various tests, the vessel, named Ning Yuan Dian Kun, was delivered in Ningbo, Zhejiang province, on Wednesday."



In the sentence, the structure "was delivered" is in the: 

Consider the distribution below:

• They turned down the proposal. • They turned the proposal down. • They turned it down. • *They turned down it. • They looked after the student. • *They looked the student after.

Which analysis accounts for the contrast?
Choose the only sentence in which the verb pattern is correctly used.
Choose the alternative in which the Past Perfect is used correctly to indicate a sequence of actions occurred in the past.
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