I'm afraid I've taken ______ too much of your time.

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I’m afraid so I don’t know I don’t think so I hope not

have taken had been taken will take are being taken

任一时刻i总大于0 任一时刻i总小于0 i值在0～Im之间变化 i值-Im～Im之间变化

have taken had been taken will take are being taken

i= Im sin ω t i= Im sin（ω t＋90°） i= Im sin（ω t－90°） i= Im sin（ω t＋180°）.

I’m afraid so I don’t think so I have no idea I hope not

look up to keep up with l

i=Im sin（ω t＋180°） i=Im sin（ω t－180°） i=Im sin（ω t＋90°） i=Im sin（ω t－90°)

I’m afraid so I don’t think so I don’t know I hope not

I’m afraid so I don’t think so I don’t know I hope not （2005年江西中考试题）

I’m afraid so I don’t think so I don’t know I hope not

i=Im sin（ω t＋180°） i=Im sin（ω t－180°) i=Im sin（ω t＋90°） i=Im sin（ω t－90°）

e=Imsinωt e=ImωLsin（ωt+90°） e=ImωLsin（ωt-90°） e=ImωLtsinωt

I don’t think so I’m afraid so I don’t know I hope not

have taken had been taken will take are being taken

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give out give up g

negative negotiate neat nightmare