By the end of the last month, I_________all the CDs Of Justin Bieber.
A．collectB．collectedC．have collectedD．had collected
D
這題考查時(shí)態(tài)：By the end of +過去時(shí)間，就用的是過去完成時(shí)，這是固定用法
句意是：到這月底為止，我已經(jīng)收集所有Justin Bieber.的CD了選D。
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