题干
—Hey, Tim. Do you have time ________ tennis with me?
—Yes, I________.
A：to play; have
B：to play; do
C：playing; have
答案(点此获取答案解析）
B
—Hey, Tim. Do you have time ________ tennis with me?
—Yes, I________.
A：to play; have
B：to play; do
C：playing; have
种结果的原因是培养液中（ ）