It _____ for a week and the streets were flooded.
A. has rained
B. was raining
C. had been raining
D. has been raining
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He said that he _______ since two o’clockthatmorning.
A. waswriting
B. wrote
C. has been writing
D. had been writing
It ____ that every student will pass the examination.
A. hoped
B. is hoped
C. hopes
D. is hoping
By the end of thiscentury, scientists ______ a cure for the common cold.
A. must discover
B. must have discovered
C. will have discovered
D. would discover
Mr. Smith _______with the government for 40 years by the time he retired.
A. would have worked
B. has worked
C. could have worked
D. had worked