—I wonder why Sara looks worried today.—I'm not sure but she 　　　　 a small accident driving

问题补充：

—I wonder why Sara looks worried today.

—Im not sure，but she a small accident driving here.

A. could have

B. might have

C. might have had

D. must have had

答案：

A. could have

B. might have

(答案→)C. might have had

D. must have had

解析：可联系答.案.网客服索取。