The building of an ecological civilization has entered a critical period, _________that requires more quality products to meet people’s demand.
A.it B.that C.one D.the one
—You are late for the morning assembly again!
—I’m terribly sorry. I _______a contract almost the whole night.
A.was drafting B.have been drafting C.have drafted D.had drafted
—I am going to the library. Do you have any books_______?
—No, but thank you all the same.
A.to return B.returned C.to be returned D.returning
With scenic spots exploring new projects, ticket sales will no longer be the only source of______.
A.revision B.revenue C.revolution D.review
Since COVID-19 has largely been brought______, people in China are returning to their work in an orderly manner.
A.under control B.under way C.under discussion D.under threat
A research project is quite different from homework__________you know there is a solution.
A.which B.where C.what D.that
