If you are a successful language learner, you ______ independently, actively, and purposefully.
A、
had probably been learning
B、
have probably been learning
C、
were probably learning
D、
have probably been learned
【正确答案】
B
【答案解析】
解析：have been doing是动词的现在完成进行时形式，表示从过去某时开始一直延续到现在的行为。根据句意，选项B正确。
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