Ⅰ.单项填空
1．(2015· 南京市二模)Tom had been studying French hard for nearly three years________he mastered it.
A．after B．when C．since D．before
答案 D [句意：汤姆努力学习了三年后才精通法语。根据前后句关系可知，“学习法语”在“掌握法语”之前，故用before。]
2．(2015·成都二模)One important aim of our school is to prepare us for the future________we can face all the challenges with confidence.
A．in case B．so that
C．even if D．if only
答案 B [句意：我们学校的一个重要目标是让我们为未来做准备，以便我们可以有信心地面对所有的挑战。so that“以便”，引导目的状语从句，符合句意。]
3．(2015·重庆一中月考)________all of them are good at playing basketball, only five will be chosen.
A．While B．If
C．Now that D．Since
答案 A [句意：虽然他们都擅长打篮球，但只会选五个人。while表示“虽然，尽管”，符合句意。if“如果”；now that“既然”；since“因为”。]
4．(2015·长春二模)________children believe they can succeed, they will never become totally confident.
A．If B．Since C．Once D．Unless
