问题
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
B:are；are
C:is；are
D:is；is
正确答案是：
同类题型
My father is lovely and _______, but sometimes he is not _______ me.
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“Would you have told him the answer had it been possible?” “I would have, but I ＿＿＿＿so busy then.”