单项选择题

Between 1974 and 1997, the number of overseas visitors expanded ______ 27%.
A) by C) to
B) for D) in
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单项选择题
Professor Wang, ______ for his informative lectures, was warmly received by his students. A) knowing C) to be known B) known D) having known
Professor Wang, ______ for his informative lectures, was warmly received by his students.
A) knowing C) to be known
B) known D) having known
单项选择题
Whatever ______ the difficulties, we must go on with the experiment. A) were C) be B) should be D) could be
Whatever ______ the difficulties, we must go on with the experiment.
A) were C) be
B) should be D) could be
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