问题
选择题
________is no doubt that today greenhouse gases are the largest human influence on global climate.
A.It
B.There
C.This
D.That
答案
答案:B
B [There is no doubt that ...为固定句型,that引导同位语从句。]
________is no doubt that today greenhouse gases are the largest human influence on global climate.
A.It
B.There
C.This
D.That
答案:B
B [There is no doubt that ...为固定句型,that引导同位语从句。]