It ________ around nine when I drove back home because it was already dark. A. had to be B. was to be C. must have been D. must be

It ________ around nine when I drove back home because it was already dark.
A. had to be
B. was to be
C. must have been
D. must be

出自：兰州大学大学英语（4）课程作业

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