21. ______ we can see, we can’t get very far in this project without her help.
A. As long as B. So long as
C. So far D. As far as
【解析】选D。as far as we can see据我们所知；as/so long as只要，语意不通；so far不引导句子。
22. He expressed his hope _____ local government will take measures to prevent A/H1N1 from spreading.
A. that B. which C. what D. where
【解析】选A。考查同位语从句。句意：他表达了他的愿望，就是当地政府会采取措施来防止甲型H1N1流感的传播。后面是hope的具体内容，从句中不缺少成分，故用that来引导同位语从句。
