对于普通门窗工程而言，其洞口内外侧与窗框之间均应采用（）填实抹平。
A.普通水泥砂浆
B.混合砂浆
C.弹性腻子
D.以上均可
参考答案：A
There are so many good books. I really don’t know ____ .
A．to choose which one
B．choose which one
C．to which one choose
D．which one to choose
生源地信用助学贷款风险补偿金比例按照当年贷款发放额的（）计算。
A.10%
B.15%
C.20%
D.25%
