Every year__of trees are planted on the hills to protect the environment.

题目

Every year__of trees are planted on the hills to protect the environment.
A.a thousand B.thousands C.thousand D.many thousand
这题我开始选C结果错了,
Date
对方地址
Dear sir,
Re:Packing for “Guangshi”Mooncake
Thank you for your proposal of regarding the packing of our order for ready-made “Guangshi” Mooncake.We’d like to confirm our packing requirments as follows:
First,each mooncake should be packed in plastic bag so that the products can be seen directly,then each bag must be filled with nitrogen(氮气) in the inner,which can extend quality guarantee period of the products,10 bags to a exquisite case next,which will help to promote the sales.In order to save more safe,50 cases to a cardboard carton.The cartons should be strong enough against rough handing and long ocean transportation.
Please pack the goods strictly.As the Mid-Autumn festival is coming,please speed up shipment for us to catch it.
Yours faithfully,
Jet
Manager
这里有个语法错误，请帮指出

答案

答案：Every year【thousands 】of trees are planted on the hills to protect the
environment.
解析；thousands of 固是定搭配,翻译为成千上万.
注意；如果这道题没有of的话就选择A.
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