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

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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

单项选择题

______ we have all the materials ready, we should begin the new task at once.

A. Since that
B. Since now
C. By now
D. Now that

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