— Have you been here before?— Yes. This is the third time that I ______ to Shanghai. A．come

— Have you been here before?— Yes. This is the third time that I ______ to Shanghai. A．come

C

试题分析：考察固定句式中的时态。固定句式：It /That/This is the...time that sb have done sth；It /That/This was the...time that sb had done sth。“这是某人第几次做某事的时候了”；结合日常生活实际，能够计算到这是第几次做某事，表明该动作已经发生，因此，要用完成时态——主句用现在时，从句用现在完成时；主句用过去时，从句用过去完成时。本句前面使用了is。说明后面使用的是现在完成时。故C正确。 点评：本题的固定句式为：It/This is/was the序数词 time that从句，句意：是某人第几次做某事的时候了。如果前面是is，后面就使用现在完成时；如果前面是was，后面就是过去完成时。