单选题 Only then he became aware of the fact that there were more difficulties ahead than he had expected.
A. Only then
B. he became
C. the fact
D. than

【正确答案】 B
【答案解析】改为did he become。only放于句首且加副词时,后面句子要用倒装语序。本句的意思是:“直到那时他才意识到有着比原来想象中更多的困难。”