(3) When he _____ is not known yet. But when he ____, he will be warmly welcomed.
A. comes, comes B. will come, will come
C. comes, will come D. will come, comes
答案选 D,第一个 when 引导的是主语从句,第二个 when引导的是时间状语从句。
另外,当主句为过去时态时,宾语从句通常要用过去的某种时态与之呼应(表客观真理时除外):
The teacher told us that he knew everything. 老师告诉我们他知道一切。
The teacher told us that light travels faster than sound. 老师告诉我们光比声音传播得快。
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