问题补充：
It was Jane I saw in the library this morning.
A. that
B. which
C. what
D. when
答案：
(答案→)A. that
B. which
C. what
D. when
解析：考查强调句：强调句的结构是：It is/was+强调部分+that+其余部分。判断是否是强调句的方法是去掉强调结构，如果句子仍然成立就是强调句：这句话去掉强调结构句子是：I saw Jane in the library this morning.所以是强调句，强调的是宾语，选A。
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