1.【2019·江苏卷·单项填空】 30.__________ the convenience of digital payment, many senior citizens started to use smart phones.
A. To enjoy B. Enjoying C. To have enjoyed D. Enjoy
【答案】A
【解析】考查非谓语动词。此处是不定式作目的状语。句意：为了享受数字支付的方便，很多老年市民开始使用智能手机。故选A。
2.【2019·天津卷·单项填空】4.____________ to think critically is an important skill today's children will need for the future.
A. Learn B. Learned
C. Learning D. Having learned
【答案】C
【解析】考查动名词。句意：学会批判性思维是当代小孩未来所必需的重要技能。句子缺少主语成分，而过去分词、动词都不可以做主语。此处用动名词做主语，故选C。
