Chemicalsalsostayinthegroundandundergroundwaterforalon...

问题详情：

 Chemicals also stay in the ground and underground water for a long time, ______affects crops and, ________, animals and humans.

   A. this; however       B. that; therefore      C. which; therefore        D. which; so

【回答】

C

知识点：定语从句

题型：选择题