10 - 离问题结束还有 14 天 16 小时

10 - 离问题结束还有 14 天 16 小时
1.The teacher could find no ____ with his pupil's work.
A.blame B.mistake C.failure D.fault
我不明白为什么要D,我选的是B
2.It is a long time _____.
A.when I saw you last
B.then I saw you last
C.for I saw you last
D.since I saw you last
我搞不懂为什么不是完成时却要D
3.He knew that was William ____ in at the gate.
A.come B.coming C.to be come D.to come
为什么?