has recently been done to improve the conditions of elementary schools a great number of

问题补充：

has recently been done to improve the conditions of elementary schools, a great number of children are unable to go to school.

A. That

B. What

C. In spite of what

D. Though what

答案：

A. That

B. What

(答案→)C. In spite of what

D. Though what

解析：可联系答.案.网客服索取。