Question

【题目】It was unusual that such close neighbors ______ not know one another.

A. could B. would C. must D. should

Answer 1

【答案】D

【解析】情态动词could能够，可能；would会；must必须，一定，非得；should应该，竟然；句义：如此亲密的邻居竟然相互不认识真是太不同寻常了。根据句义可知本句中的should表示“竟然”，说明惊讶的语气。故D正确。