题干
What ______ you ______ when it began to rain last night?
A：do; do
B：are; doing
C：were; doing
D：did; do
答案(点此获取答案解析）
C
What ______ you ______ when it began to rain last night?
A：do; do
B：are; doing
C：were; doing
D：did; do
