There is a trash bin _____________ the door. [ ]
A. on
B. in
C. behind
答案：C
—Let's go to play soccer this afternoon, Jack.
—Sorry, I ______ a piano lesson. [ ]
A. had
B. am having
C. didn't have
D. am not having
2011年的麦收季节，某农场用收割机收割小麦，前3天收割了165公顷．照这样计算，10天可以收割多少公顷？（用比例知识解答）
