非谓语动词
1． Many airlines now allow passengers to print their boarding passes online ________ their valuable time.
A．save B．saving
C．to save D．saved
C 考查非谓语动词。不定式表示目的， 故答案选 C。句意：现在很多航空公司为节省乘客的时间所以允许他们在线打印登机牌。
2． The national park has a large collection of wildlife, ________ from butterflies to elephants.
A．ranging B．range
C．to range D．ranged
3． Jim has retired, but he still remembers the happy time ________ with his students.
A．to spend B．spend
C．spending D．spent
D 考查非谓语动词。 “时光”是被度过，而且这里指的是“已经被度过的时光”， 故选 D 。句意：吉姆已经退休了， 但他仍然记得跟学生们一起度过的快乐时光。
4． Many Chinese brands, ________their reputations over centuries，are facing new challenges from the modern market.
A．having developed B．being developed
C．developed D．developing
A 考查非谓语动词。many Chinese brands与develop是逻辑上的主谓关系，也是主动关系，再根据over centuries(数百年了)可知“发展”的动作在“面临挑战”之前早就完成了，故用现在分词的完成式，故选A项。句意：许多已经发展了几个世纪的声誉的中国品牌，现在正面临着来自现代市场的新挑战。