问题
选择题
By the end of last year, they _______ 2,000 English words.
A． learned
B． have learned
C． had learned
D． learns
答案
答案：C
本题考查过去完成时的用法。即表示发生在过去某一时间（By the end of last year）之前的动作。
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By the end of last year, they _______ 2,000 English words.
A． learned
B． have learned
C． had learned
D． learns
答案：C
本题考查过去完成时的用法。即表示发生在过去某一时间（By the end of last year）之前的动作。