目前，沪、深证券交易所只有国债回购标准券库，企业债券回购尚未设置单独的标准券库。( )
参考答案：对
I don't think____possible to learn English well without ____memory work.[ ]
A. it; many
B. that; a large number of
C. one; a great deal of
D. it; a good deal of
设a=6，则执行x=IIf(a＞5，-1，0)后，x的值为 【9】 。
