题干
I was studying for the test when the rainstorm came．（对划线部分提问）
____ were you____ when the rainstorm came？
答案(点此获取答案解析）
What,doing
I was studying for the test when the rainstorm came．（对划线部分提问）
____ were you____ when the rainstorm came？
2NaCL反应中，