19.Loulan,a stopping point on the famous Silk Road between the East and the West,is believed _______ over by sandstorms from AD 200to AD 400.( )
A. | to have gradually covered | B. | gradually to be covered | ||
C. | gradually to have covered | D. | to have been gradually covered |
18.Every year,people from all over the country move to Beijing _____ better jobs.( )
A. | in need of | B. | in search of | C. | in praise of | D. | in support of |
17.You've failed to do what you ______ to and I'm afraid Mom will blame you.( )
A. | were expected | B. | are expected | C. | will expect | D. | would expect |
16.After studying in a medical college for five years,Jane ______ her job as a doctor.( )
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A. | set out | B. | set up | C. | took up | D. | took over |