Question

By the time of last year, she ______ the piano for five years.

A．learnt

B．has learnt

C．had learnt

D．will learn

Answer 1

C

解析试题分析：句意：到去年结束之前，她已经学习钢琴五年了。过去完成时态是指动作发生在过去的过去。by the time of …过去完成时态的标志词，结构：had done ,故选C。
考点：考查过去完成时态。