语法与词汇
7.
Over the past several decades, governments at all levels______no efforts to improve people's living conditions.
A、
spare
B、
spared
C、
had spared
D、
have spared
【正确答案】
D
【答案解析】
由“Over the past several decades”可知本句用现在完成时，故选D。
提交答案
关闭