Question

(2013·浙江温州二模)Scientists have found evidence ________ global warming caused the world's first horses to become smaller nearly 50 million years ago.

A．what	B．that
C．which	D．whether

Answer 1

B

选B　考查同位语从句。句意：科学家们已经找到证据，证明大约5 000万年前，全球变暖使世界上首批马的个头变小了。根据句意可知，空后说的是evidence的内容，并且引导词在从句中不作成分，所以用that引导同位语从句。