问题
选择题
Although we met with some difficulties in building the railway, we were still _____ about finishing it before the deadline.
A．consistent
B．enthusiastic
C．responsible
D．optimistic
答案
答案：D
题目分析：考查形容词辨析：A. consistent 一致的，B. enthusiastic 有热情的，C. responsible负责任的，D. optimistic乐观的，句意：虽然我们在建铁路时碰到了一些困难，但我们对提前完成任务还是很乐观的。选D。