高一英语单项选择

1.You should understand the traffic rule by now.You've had it_____often enough.
A.explaining B.to explain C.explain D.explained

2.It was _____back home after the experiment.
A.not until midnight did he go
B.until midnight that he didn't go
C.not until midnight that he went
D.until midnight when he didn't go

3.The young should be good _____the old,and this will be good _____their growing up.
A.to;for B.to;to C.for;to D.for;for

4.Anyone who is caught_____shall not pass the exam.
A.to cheat B.cheating C.to be cheating D.cheated

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