By the time he realizes he________into a trap, it"ll be too late for him to do a

题型：陕西省同步题难度：来源：

By the time he realizes he________into a trap, it"ll be too late for him to do anything about it.[     ]
A. walks
B. walked
C. has walked
D. had walked

答案

举一反三

The Smiths________through millions of ups and downs since they moved to Sydney.[     ]
A. have gone
B. had gone
C. went
D. has gone

题型：陕西省同步题难度：| 查看答案

People taking the therapy learn what scientists _____ for years-laughter is the best medicine. [ ]
A. know
B. knew
C. have known
D. had known

题型：山东省模拟题难度：| 查看答案

It"s 7:30. I can"t believe you___ cooking dinner yet, Sally.[     ]
A. haven"t started
B. didn"t
C. don"t start
D. hadn"t started

题型：广东省月考题难度：| 查看答案

Only after _____ your homework _________ watch TV.[     ]
A. have you finished; you can
B. you have finished; can you
C. have you finished; can you
D. you have finished; you can

题型：甘肃省同步题难度：| 查看答案

Great changes ________in my hometown and some new buildings ________.[ ]
A．have taken place；have appeared
B．have been taken place；have appeared
C．have taken place；have been appeared
D．were taken place；were appeared

题型：同步题难度：| 查看答案