问题
选择题
Mozart started writing music ______________ he was four years old.
A until B after C before D when
答案
答案：D
这题考查时间状语从句的用法，句意是：莫扎特在4岁时开始创作音乐。选D。
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Mozart started writing music ______________ he was four years old.
A until B after C before D when
答案：D
这题考查时间状语从句的用法，句意是：莫扎特在4岁时开始创作音乐。选D。