单选题

【正确答案】 D
【答案解析】此题为理解与辨别题。读懂全句后可知,空白处缺少一个相当于中文“问题”的词。有可能错选questions。question和problem的中文意思均为“问题”,前者为需要对方回答的问题,如:My question is what language is spoken in Congo.而后者则指需要解决的问题,如:It will be a big problem if you are always satisfied with what you have got.