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

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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

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

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