问题
选择题
Only when _______ 30 years old ______ to learn English.
A．was he; did he begin
B．he was; he began
C．he was; did he begin
D．was he; he began
答案
答案：C
考查部分倒装。Only+时间状语从句，放在句首时，后面主句要部分倒装，而从句不倒装。所以选C。
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