276. Many Chinese brands,___ their reputations over centuries, are facing new challenges from the modern market.
A. having developed B. being developed
C. developed D. developing
277. He seems _____ on it for days, for it is almost finished.
A. to work B. to have worked C. having worked D. working
278. In the reading room, we found her ______at a desk, with her attention _____on a book.
A. sitting; fixing B. to sit; fixed C. seating; fixing D. seated; fixed
279. The hospital has recently obtained new medical equipment _____ more patients to be treated .
A. being allowed B. allowing C. having allowed D. allowed
280 .________ to Anne's birthday party,Mr.Brown is now searching shop after shop for a nice present for her.
A. Having invited B. Having been invited
C. Have been invited D. Being invited
276-280 ABDBB
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