The fact has worried many scientists ___
题型:选择题
问题:
The fact has worried many scientists _____ the earth is becoming warmer and warmer these years. [ ]
A. what
B. which
C. that
D. through
The fact has worried many scientists _____ the earth is becoming warmer and warmer these years. [ ]
A. what
B. which
C. that
D. through