目前,我国石油人均资源占有量仅为世界平均水平的( )。
A.6.6%
B.7.1%
C.7.8%
D.7.7%
参考答案:D
对电子表格的编辑,主要是对表格中的数据进行()和替换等操作。
A.增加
B.删除
C.修改
D.查找
— How long is it _____ you picked up your badminton training?
— It was not until my finance became better in last December _____ I started the training.
A.since; that
B.before; when
C.until; that
D.that; when