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
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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
单项选择题
The bold soldier would rather die than ______ to these cruel enemies. A) to yield C) yielding B) yield D) have yielded
The bold soldier would rather die than ______ to these cruel enemies.
A) to yield C) yielding
B) yield D) have yielded
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