单项选择题

The leaders met to discuss the problems facing their（）countries.

A. respective
B. respected
C. respectable
D. respectful

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单项选择题
Professor Liu（）for 20 years by the end of next summer.

A. has taught
B. will he teaching
C. has been teaching
D. will have taught
单项选择题
When did the woman get the necklace（）

A. Five years ago.
B. Four years ago.
C. Six years ago.
D. Not long ago.
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