单选题

There was (a pause of) complete stillness (which) the (buzzing of) the bees among the pink loses sounded (as loud as) the fight of an aircraft.
A. a pause of B. which C. buzzing of D. as loud as
【正确答案】 B
【答案解析】which改为when。先行词a pause是表示时间的词，所以定语从句引导词用 when。