单项选择题
A．should have been B．would have been C．could have been D．might have been
You （） engage in serious debate or discussion unless yo...
单项选择题You （） engage in serious debate or discussion unless you are willing to endure attacks.
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
