单选题In the conversion of the soil at the Hallside site, ______.A two types of worms are being used.B three types of worms are being used.C many types of worms are being used.D thousands of different types of worms are being used.
题目
单选题
In the conversion of the soil at the Hallside site, ______.
A
two types of worms are being used.
B
three types of worms are being used.
C
many types of worms are being used.
D
thousands of different types of worms are being used.