单项选择 适中0.65 引用1 组卷124
Seventy-one percent of the earth ________ covered by water.
| A．has | B．have | C．is | D．are |
20-21高二·全国·课时练习
类题推荐
So far, how many trees __________ by the students in our school?
| A．are being planted | B．are planted | C．have been planted | D．has been planted |
—Did you hear the noise downstairs this afternoon? What was that?
—Yes. I forgot to tell you. A new machine________then.
—Yes. I forgot to tell you. A new machine________then.
| A．has tested | B．had tested |
| C．was tested | D．was being tested |
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