Question

Mr White ________ at 8∶30 for the meeting, but he didn't show up．

A. should have arrived
B. should arrive
C. should have had arrived
D. should be arriving

Answer 1

答案A
全句意为“怀特先生8∶30(原本)应该到会的，但他没露面”。全句谈的是过去应做的事但没有做，故应使用should have done结构，表原本该做而没做某事。故答案为A。
一定要掌握should have done/ought to have done表示“应该做的事而未做”。同时，也要注意情态动词的同类结构的不同用法。如：must have done表示对过去肯定的推测，can't have done是表示“对过去否定的推测”。