【题目】— Do you know our town at all?
—Surely, this ________ the third time I ________ here.
A. was; has come B. is; come
C. is; had come D. is; have come
在线课程【答案】D
【解析】考查时态。句意：你究竟知道我们的城镇吗？——不，这是我第一次到这儿来。可知主语描述的是现在的状态，故用一般现在时态。从句描述的是现在已完成的动作，故用现在完成时态。故选D。