The ground is wet all over, so I’m sure it must have rained last night, ________?
A．wasn’t itB．didn’t itC．isn’t itD．doesn’t it
B
本題考查反義疑問(wèn)句。I’m sure it must have rained last night, ________?
主句主語(yǔ)為I，所以對(duì)從句反問(wèn)，it must have rained last night，有具體的過(guò)去時(shí)間last night，所以用一般過(guò)去式didn’t it 。如果沒(méi)有具體的過(guò)去時(shí)間，則用完成時(shí)hasn’t  it。所以選B。
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