The professor can hardly find sufficient grounds _________

单选题 The professor can hardly find sufficient grounds __________ his argument in favor of the new theory．

A．which to base on
B．on which to base
C．to base on which
D．which to be based on

参考答案B

解析: B。教授几乎无法找到支持这种新理论的充足证据。
考查定语从句的特殊用法。本题考查“介词+关系代词”引导的定语从句。在正式文体中，“介词+关系代词”引导的定语从句可压缩为“介词+关系代词+不定式”结构。此外，which指代sufficient grounds，介词on楗前，故诜B。

单选题 There is ro reason they should limit how much vitamin you take, __________ they can limit how much water you drink．

A．much more than
B．no more than
C．no less than
D．anymore than

单选题 I don't think he could have done such a stupid thing last night,

A．do I
B．could he
C．did he
D．has he

单选题 __________ is generally accepted, economical growth is determined by the smooth development of production．

A．What
B．That
C．It
D．As