题目内容
20．-How long do you want me to heat the oil？-Heat it till it _________ to smoke．（ ）
| A． | would begin | B． | begins | C． | will begin | D． | began |
分析 --我需要把油加热多长时间？
--一直加热到开始冒烟．
解答 答案：B．
在主句为将来时态的句子中，从句用一般现在时表示将来发生的动作，下文省略了you will，即全文完整句子应该是You will heat it till it begins to smoke．故选B．
点评 对于时态的题要学会分析句子的结构，看是否为省略了句子中的某部分，然后将省略的成分补充完整再对句子进行理解，答案可能就会更容易的得出．
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