单项选择题

My pain ______ apparent the moment I walked into the room, for the first man I met asked sympathetically: "Are you feeling all right"

A. must be
B. must have been
C. had been
D. had to be
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单项选择题
______ an answer, she decided to write him another letter.
A. Not having received

B. Not receiving
C. Not received

D. Not being received
单项选择题
By the middle of the 21st century, the vast majority of the world's population ______ in cities rather than in the country.
A. are living
B. will be living
C. have lived
D. will have lived
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