问题

Tens of thousands of trees _____ in the area in the past few years

A:have been planted
B:were planted
C:have planted
D:had planted

正确答案是：

同类题型

I’m ________ of country music. I often listen to its CDs.

. Little ______about his own health though he was very ill.

Shall we go to play football—________ . Let’s go!

Look! Some women are chatting _____ over there and the rest _____ looking at the pictures.

Single-parent usually____ some of the functions that absent adult in the house would have served under the financial crisis.