--- You can’t imagine _______ great fun playing puter games is.
--- Really? But it may cause you a lot of trouble.A.what aB.howC.whatD.how a
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C解析以what引导的感叹句的基本句型结构为what a/an +adj+可数名词单数+主语+谓语！；what+adj+可数名词的复数/不可数名词+主语+谓语！以how引导的感叹句的基本句型结构为how+adj/adv+主语+谓语！