单选题 We haven't heard from Jane for a long time. What do you suppose ______ to her?

【正确答案】 B
【答案解析】[解析] 考查动词的用法。happen为不及物动词,没有被动语态,排除 [C]项,通过分析,句子缺少谓语,排除[A]、[D]项。所以答案为 [B]。