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Ⅰ.单项填空 1．(2017· 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．(2017·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．(2017·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．(2017·长春二模)________children believe they can succeed, they will never become totally confident. | 
