We have planted thousands of trees in recent years. This year we’ve planted ten thousand

问题补充：

We have planted thousands of trees in recent years. This year we’ve planted ten thousand trees.

A. even

B. just

C. alone

D. only

答案：

A. even

B. just

(答案→)C. alone

D. only

解析：考查：副词alone，意为仅仅，只是，要后置，even甚至，just，only仅仅要前置，句意：最近几年我们种了成千上万棵树，仅仅今年我们已经种了一万棵。所以选C。