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
网友回答
(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。