单项选择 适中0.65 引用1 组卷526
I think it's difficult for him____English well.
A.studies | B.studying |
C.to study |
19-20八年级上·全国·单元测试
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It is our duty _________ our hometown clean and beautiful. We must do something for it.
A.to keep | B.keeps | C.keeping |
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