问题
The explosion of a chemical plant in Yancheng Jiangsu province last month led to over 100 people ______ to hospital for treatment, ______ their relatives to be in deep sorrow.
A:sending; causing;
B:sent having caused
C:being sent; causing;
D:to send; to cause;
B:sent having caused
C:being sent; causing;
D:to send; to cause;
正确答案是：
