A: 正确
B: 错误
举一反三
- At present, the pathogenesis of Phobia has been clearly studied.
- The relationship between employers and employees has been studied ________.
- __________ this material can be used in our factory has not been studied yet.
- One theory is that the ________ has been present in humans for a very long time.
- 18. How long has Mr. Smith been working in the present office? For
内容
- 0
The economic situation has been worsening, causing economists to _____whether the present policies are sustainable.
- 1
The relationship between China and India has been ________ studied recently. A: originally B: extremely C: violently D: intensively
- 2
Even though Tom _________ Chinese for three years before he came to China, it is still difficult for him to express himself. A: studies B: has studied C: had been studying D: was studied
- 3
Leadership ________. A: has a requirement of at least five members to be led B: is based on management direction C: research has shown that it cannot be developed D: has only been studied since the early twentieth century
- 4
—I thought you had English. —No. It has been useful in my work. A: studied B: dropped C: failed D: passed