One day he was playing basketball ______ he fell and brock his leg.
空处填until还是when?我认为是填until,因为是:直到他摔伤了腿为止,他一直在打篮球。
填when,句意:一天他正在打篮球,这时他突然跌倒,摔断了腿。
when是并列连词,用来构成并列句,意为“就在这时;突然”,相当于but (and, just) then。when后常接副词suddenly以强调其后并列分句动作的突然性,有使人意想不到的含义。注意:when所连接的并列分句不能位于句首。例如:
She had just lain down, when (suddenly) the baby woke up. 她刚刚躺下来,婴儿突然醒了。
We were watching TV, when the power went out. 我们正在看电视,突然停电了。
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