（题文）In the last few years, China ___ great achievements in environmental protection.
A. has made B. had made
C. was making D. is making
（题文）Silk ______ one of the primary goods traded along the Silk Road by about 100 BC.
A. had become B. was becoming
C. has become D. is becoming
When walking down the street, I came across David, whom I _____ for years.
A. didn’t see B. haven’t seen
C. hadn’t seen D. wouldn’t see
（题文）More efforts, as reported, ______in the years ahead to accelerate the supply-side structural reform.
A. are made B. will be made
C. are being made D. have been made
I ________ half of the English novel, and I’ll try to finish it at the weekend.
A. read B. have read
C. am reading D. will read
（题文）Jack ________ in the lab when the power cut occurred.
A. works B. has worked
C. was working D. would work
