单选题
Only when (he realized) that there (would be) more (difficulties) ahead than he expected (he came to) me for help.
A、
he realized
B、
would be
C、
difficulties
D、
he came to
【正确答案】
D
【答案解析】
改为did he come to。因为only(when)置于句首，句子要倒装。
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