【加固训练】
(2017·杭州模拟)There is still some doubt ________ the system will work even though all the factors have been considered.
A. that B. which
C. why
D. whether
【解析】选D。句意: 即使所有的因素都考虑了, 这个系统是否会运行仍有些疑问。There is some doubt whether. . . 对……有些疑问为固定句型。
7. His confidence built up ________ as he gained more and more experience in teaching.
A. mostly B. generally
C. constantly
D. gradually
【解析】选D。句意: 随着教学经验的不断增加, 他的信心逐渐增强。gradually逐渐地, 渐渐地; mostly主要地; generally一般地; constantly不断地, 时常地。
8. (2017·淮安模拟)Microsoft ended support for Windows XP after April 8, which ________ a major operating system for some Chinese computer users, and advised users to upgrade to Windows 8. 1.. remained
B. remains
C. is remainingD. is remained
【解析】选B。句意: 4月8日之后, 微软对Windows XP的支持结束并建议用户更新到Windows 8. 1, Windows XP对一些中国电脑用户来说依然是主要的操作系统。remain是系动词, 没有进行时也不能用于被动语态, 根据句意可知应用一般现在时。
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