“肝火犯肺”是属于（）。
A.子病犯母
B.相克
C.相乘
D.相侮
E.母病及子
参考答案：D
Mary forgot（）a letter to her mother, so she wrote to her just now.
A.writing
B.to write
C.having wrote
D.to have written
美国植物新品种保护制度由哪几部法律构成？
