¸ßÈýÏÂѧÆÚÓ¢Óï½×¶Î²âÊÔ
II. Ó¢Óï֪ʶÔËÓ㨹²35СÌ⣻Âú·Ö45·Ö£©
A) µ¥ÏîÑ¡Ôñ ´ÓA¡¢B¡¢C¡¢DËĸöÑ¡ÏîÖÐ, Ñ¡³ö¿ÉÒÔÌîÈë¿Õ°×´¦µÄ×î¼Ñ´ð°¸(15·Ö)¡£
21. Whenever I met with difficulties, I _____ to my mother for help.
A. would turn B. used to turn
C. had turned D. turned