时态选择I wont tell the student the answer to the maths problem
时态选择
I wont tell the student the answer to the maths problem until he____on it for more than an hour.
Ahas been workiong
Bwill have worked
Cwill have been working
Dhad worked
I wont tell the student the answer to the maths problem until he____on it for more than an hour.
Ahas been workiong
Bwill have worked
Cwill have been working
Dhad worked
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你能帮帮他们吗