Question

 (2011年浙江温州联考)The fact has worried many scientists________the earth is becoming warmer and warmer these years.

A．what                     B．which

C．that                       D．though

Answer 1

解析：选C。考查名词性从句。句意：近年地球越来越暖的事实让许多科学家担心。从句“the earth is becoming warmer and warmer these years”不缺少成分，因此选C项。that引导的从句作fact的同位语。