Only when he returned from the exchange program ________ how much he enjoyed it.

题型：同步题难度：来源：

Only when he returned from the exchange program ________ how much he enjoyed it.[      ]
A.  he knew
B.  he had known
C.  did he know
D.  had he known

答案

举一反三

As he pushed her, sitting on a swing, she ________ higher and higher. [ ]
A. swung
B. wandered
C. swept
D. whispered

题型：同步题难度：| 查看答案

The first decade of the 21st century ______ breathtaking, non-stop development in China ? [      ]
A.  witnesses
B.  witnessed
C.  will witness
D.  had witnessed

题型：内蒙古自治区期中题难度：| 查看答案

-I"m sorry, but there"s no smoking in this section on the train.
-Oh, I ________ that, and I won"t again.[     ]
A．don"t know
B．didn"t know
C．won"t
D．haven"t known

题型：同步题难度：| 查看答案

Had it been possible I would have gone to the movies but I ________ too busy.[     ]
A．had been
B．am
C．was
D．would be

题型：同步题难度：| 查看答案

-Mum, where is my lunch pack?
-Just where it ________.[     ]
A．has been
B．had been
C．was
D．be

题型：同步题难度：| 查看答案