↑ 收起筛选 ↑
试题详情

It is said that a reliable treatment for the disease will be applied at least two or three months away and still it ______on animals.

A. is testing                          B. has tested                      C. is being tested                        D. has been tested

高三英语单项填空中等难度题

少年,再来一题如何?
试题答案
试题解析
相关试题