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包含原则,是指一个相对较大的时间范围内包含某个精确时间点,在这个精确的时间点发生了某个事件,则以精确事件为焦点,作为主句,置于句首,而关于时间范围的事件,沦为背景信息,作为从句或从属成分,在句中居于偏后的位置。下列句子中体现了该原则的是
A、She was awake when he came.
B、It began to rain when I was watering the garden.
C、The class began after the bell rang .
D、He heard a knock at the door while he was reading the letter.
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