单项选择题
A．have better not B．had better not C．have better not to D．had better not to
When I worked as a bank clerk, I had the opportunity to...
单项选择题When I worked as a bank clerk, I had the opportunity to meet a rich （） of people: students, soldiers and factory workers.
A．diversity B．kind C．range D．variety
（） my neighbor's kid with his coming exam, I spend an h...
单项选择题（） my neighbor's kid with his coming exam, I spend an hour working with him every day.
A．To help B．Helping C．Helped D．Having helped
Coffee has been a favorite drink for centuries, （） the ...
单项选择题Coffee has been a favorite drink for centuries, （） the time when we were drinking it strong and black, without sugar.
A．during B．for C．before D．since
