单选题 He must give us more time, ______ we shall not be able to make a good job of it.
【正确答案】 B
【答案解析】[解析] 本题考查逻辑关系词辨析。consequently和therefore表因果,doubtlessly意为“确定地,无疑地”,三者均不能使此处语义通顺。只有otherwise(否则)能使此处逻辑通顺,故答案为B。