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  3. A series of pre-recorded tapes ______ already been prepared for language laboratory use by now.

A series of pre-recorded tapes ______ already been prepared for language laboratory use by now.

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问题 A series of pre-recorded tapes ______ already been prepared for language laboratory use by now.
选项 A、have
B、has
C、will
D、had
答案B
解析 该句意为“到现在为止，一系列预先录好的磁带已经准备妥当，备语言实验室使用”。本题考查的是主谓一致的原则。当主语由“a portion of”，“a series of”，“a kind of”等+名词构成时，谓语动词用单数。因此，选项B正确。
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