问题
选择题
It was not until dark _______ he found _______ he thought was the correct way to solve the problem.
A．that; what
B．that; that
C．when; what
D．when; that
答案
A
这是—个带有宾语从句的强调句型。主句是not...until句型。该句型被强调时，只能强调not+until引导的状语。宾语从句是由关系代词what引导的。