Homework____________on time will lead to better grades.A. done B. having done C)) be done D. to A: having done B: done C: be done D: to have been done

It is necessary that something urgent ______ to combat smuggling. A: is done B: be done C: has to be done D: must be done

My suggestion is that the experiment ______ in another way. A: is done B: will be done C: has been done D: be done

下列代码样例中，哪个存在错误：() A: for filename in $(ls) do cat $filename done B: for((i=0;i<10;i++)) do echo $i done C: x=1 sum=0 while [ $x -le 10 ] do let sum=sum+$x let x=x+1 done echo\ $sum D: for $i in 1 2 3 4 5 do echo $i done

哪个选项不是正确的完成时态? A: have/has done B: had done C: will has done D: will have done E: would have done

It’s not a good habit to leave your work __________ . A: done half B: half done C: a half done D: done a half

It’s high time ______ about the traffic problem． A: something was done B: everything is done C: anything will be done D: nothing to be done

It’s high time _____ about the traffic problem. A: anything will be done B: something was done C: nothing be done D: something is done

It's time that ______ about the traffic problem downtown. A: something was done B: anything will be done C: everything is done D: nothing to be done

The work_______by the time you get there. A: has been done B: had been done C: will have been done D: will be done