问题
选择题
As is recorded in history, silkworms（蚕）were first raised by a woman in _________ is today Hebei Province．
A．where
B．the place
C．which
D．what
答案
答案：D
主要测试宾语从句。从句子的语境来看可知介词in需要宾语，同时句子_________ is today Hebei Province中有需要主语，另外结合答案可知只有what可以充当此双重作用，当然如果B后接that 或which也是正确的，但是那就变成了定语从句。