5.For years,doctors________millions of patients lives with the help of microscopes.
A: A.saved
B: B.have saved
C: C.has saved
D: D.were saving
A: A.saved
B: B.have saved
C: C.has saved
D: D.were saving
举一反三
- 5. For years, doctors ______ millions of patients’ lives with the help of microscopes. A: have saved B: are saving C: will save D: were saving
- For years, doctors ___ millions of patients’s lives with the help of microscopes. A: have saved B: are saving
- For years, doctors ________ millions of patients’ lives with the help of microscopes. A: have saved B: are saving C: will save D: are saving
- For years,doctors___ millions of patients’ lives with the help of microscopes. A: have saved B: are saving
- For years,doctors ___________millions of patients’ lives with . A: have saved B: ale saving C: will save D: were saving