Do you have any idea when the project will be carried out?—No but I have heard that it w

问题补充：

Do you have any idea when the project will be carried out?

—No, but I have heard that it was not until last month it was approved.

A. that

B. when

C. since

D. before

答案：

(答案→)A. that

B. when

C. since

D. before

解析：句意：--你知道这个项目将什么时候被执行吗？---不，但是我听说直到上个月它才被批准。此处是it was not until……that……结构，表示知道……时候才…….，故答案选A。