Question

When he arrived at the airport，Mr．Smith found that he________ his ticket in the office．

A.has left
B.was leaving
C.had left
D.would leave

Answer 1

【答案】：C

主句的行为发生在从句之前，时态就要提前。从句是过去时，主句就应是过去完成时。【句子大意】Smith到达机场时才发现机票落在办公室了。