单选题 The______to the contract must be signed by two witnesses.

【正确答案】 B

【答案解析】解析：近形词辨析。句意：合同附件需有两位见证人签字。attachment附件；依恋。assign—ment分配；任务。assessment评定；估价。alignment队列；校准；结盟。attachment tothe contract合同附件。