By the end of the last month, I _____________ all the CDs of Justin Bieber.
A．collectB．collectedC．have collectedD．had collected
D
這里是考核時態(tài)的內(nèi)容，根據(jù)by the end of+過去時間，我們知道是考核“過去完成時”的內(nèi)容。
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