单项选择 适中0.65 引用3 组卷184
I think it is very important for students ________ hard.
A.work | B.to work | C.working | D.are working |
20-21八年级下·山东济南·期中
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It’s hard for scientists ________ how large the universe is.
A.understand | B.understanding | C.understood | D.to understand |
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