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