托业考试

根据网考网考试中心的统计分析，以下试题在2018/5/30日托业考试习题练习中，答错率较高，为：48%
【单选题】Although Apple has not disclosed how many iPhones were ______ at launch on Friday, analysts expect stocks will sell out by early next week.

• (A) useful
• (B) available
• (C) replaceable
• (D) inevitable