—It's already twelve o'clock, and he ____________ have been here half an hour ago.—Maybe his flight was behind time.

题型：单选题题类：常考题难易度：普通

高中英语人教版（新课程标准）2017-2018学年高一下册必修三Unit 2 Healthy eating同步练习2

—It's already twelve o'clock, and he ____________ have been here half an hour ago.

—Maybe his flight was behind time.

A、must B、ought to C、may D、can

举一反三

—Oh, sorry.

—I guess so. It's not difficult after all.

—Mum, it's not been decided yet. I ______ continue my study for a higher degree.

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