题文
（浙江杭州）In summer milk will quickly go bad________it is put into a fridge．
| A．though |
| B．unless |
| C．because |
| D．once |
（浙江杭州）In summer milk will quickly go bad________it is put into a fridge．
| A．though |
| B．unless |
| C．because |
| D．once |
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