单选题 Everybody ______ in the hall where they were welcomed by the secretary.
A. assembled B. accumulated C. piled D, joined

【正确答案】 A

【答案解析】[解析] 本题测试词义辨析。assemble意为“集合”；accumulate意为“积累，堆积”；pile意为“堆起”；join意为“连接，加入”。根据题干，A正确。