侵染循环
参考答案：
病原菌在植物一个生长季节引起第一次发病，到下一个生长季节再一次引起发病的过程。
Dina, for months to find a job as a waitress, finally took a position at a local advertising agency. [ ]
A. struggling
B. struggled
C. having struggled
D. to struggle
在控制面板中设置的打印机可以在（）改变。
