摘要： trees are planted each year on the Tree-Planting Day all over the country. A. Tens of thousand B. Tens of thousands of C. Ten of thousands of D. Tens and thousands
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______ trees are planted each year on the Tree-planting Day all over the country.
A. Tens of thousands of B. Tens and thousands
C. Ten of thousands of D. Tens of thousand
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________ trees are planted each year on the Tree-Planting Day all over the country．
- A.Tens of thousand
- B.Tens of thousands of
- C.Tens and thousands
- D.Ten of thousands of