题文
The fact has worried many scientists __________ the earth is becoming warmer and warmer these years.
| A．what |
| B．which |
| C．that |
| D．though |
推荐试卷
The fact has worried many scientists __________ the earth is becoming warmer and warmer these years.
| A．what |
| B．which |
| C．that |
| D．though |
试题篮
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