问题补充：
that saw the rise of quite a number of famous women writers in China,
such as Zhang Ailing, Xiao Hong and so on.
A. During the first half of the 20th century
B. That it was in the first half of the 20th century
C. It was in the first half of the 20th century
D. It was the first half of the 20th century
答案：
A. During the first half of the 20th century
B. That it was in the first half of the 20th century
C. It was in the first half of the 20th century
(答案→)D. It was the first half of the 20th century
解析：考察强调句，强调的主语，“20世纪的前50年中国见证了很多女著名作家的崛起，像张爱玲，萧红等等。”答案D。
