.Because of the heavy sandstorm we had to put off the visit until tomorrow to the exhibit

问题补充：

.Because of the heavy sandstorm, we had to put off the visit until tomorrow to the exhibition of painting in the nearby city.

A. to hold

B. held

C. holding

D. being held

答案：

A. to hold

B. held

C. holding

(答案→)D. being held

解析：可联系答.案.网客服索取。