题目内容
18．-How about buying an iPhone 4s for your mother's birthday？-Oh，maybe it's too expensive，Dad．Do you know _______？（ ）
| A． | how much does it cost | B． | how much it costs | ||
| C． | how much it cost | D． | how much did it cost |
分析 --买一部苹果4s给你妈妈做生日礼物怎么样？
--哦，可能太贵了，爸爸．你知道它花费多少钱吗？
解答 答案：B．根据Do you know 可知，本题考查宾语从句，宾语从句中一般为陈述语序，选项AD是疑问语序，故排除；在这里询问手机的价格是叙述一件事实，所以使用的时态是一般现在时，it是第三人称单数，后面的动词应该用第三人称单数形式，在这里cost需要加s，故选B．
点评 本题考查宾语从句，做题时注意三要素时态、语序和引导词．本题先考虑语序问题，再根据句子的上下文的意思，做出选择．
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