选择题：The professor could hardly find sufficient grounds

题目内容：
The professor could hardly find sufficient grounds _____his arguments in favor of the new theory.
A、 to be based on
B、 to base on
C、 which to base on
D、 on which to base
参考答案：

在液压系统中，（）可作背压阀。(A)溢流阀(B)减压阀(C)液控顺序阀

在液压系统中，（）可作背压阀。(A)溢流阀(B)减压阀(C)液控顺序阀

分类：石家庄铁道大学-大学英语III  题型：选择题
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