问题补充:
If you suffer an injury during exercise, or if pain or discomfort makes you think an injury is developing, stop right away and call me.
A. the; a
B. 不填; the
C. an; the
D. 不填; 不填
答案:
A. the; a
B. 不填; the
C. an; the
(答案→)D. 不填; 不填
解析:可联系答.案.网客服索取。