It'll be ready ____ half an hour.A.on B.in C.after D.ago

问题描述:

It'll be ready ____ half an hour.
A.on B.in C.after D.ago

B

B
It'll be ready 表将来会准备好, in half an hour表在半小时后的意思

B
翻译:我将在半小时内准备好..
in+一段时间..用将来时

B 表示在将来一定时间段内