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
X+Y= M+N为吸热反应，对这个反应的下列说法中正确的是 （ ）