题文
The university estimates that living expenses for international students________around $8,450 a year，which________a burden for some of them.
| A．are；is | B．are；are |
| C．is；are | D．is；is |
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The university estimates that living expenses for international students________around $8,450 a year，which________a burden for some of them.
| A．are；is | B．are；are |
| C．is；are | D．is；is |
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