问题
选择题
By the time you ____ in, I ____ two letters.
A．had come, had written
B．came, wrote
C．come, have written
D．came, had written
答案
答案：D
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By the time you ____ in, I ____ two letters.
A．had come, had written
B．came, wrote
C．come, have written
D．came, had written
答案：D