题干
——What ____________ you _____________ last weekend?
——I wrote some letters and read a book.
A：do, do
B：did, do
C：will, do
D：have, done
答案(点此获取答案解析）
B
——What ____________ you _____________ last weekend?
——I wrote some letters and read a book.
A：do, do
B：did, do
C：will, do
D：have, done
装入带活塞的密闭容器中，当反应
达到平衡后，慢慢压缩，下列叙述正确的是
