问题
选择题
He earned enough money to start his own business _____ offering guide services _____ tourists.
A．by; to
B．with; at
C．on; for
D．through; with
答案
答案：A
介词by可以表示手段、原因，常置于动名词前，如：You can make the cake by mixing eggs and flour. 其次考查介词与动词offer的搭配，offer sth. to sb. =" give" sth. to sb.其中的to表示对象。