A．must have been providedB．might have providedC．m

But for your help, I ______ .A．must failB．might failC．would have failedD．will fail

【C17】A．must have beenB．may have beenC．could have beenD．should have been

I have no idea who stole his wallet. It _____anyone.A. must have beenB. should have been

An example of a product which might well have been advertised during the early stages of t

It______last night. But I am not sure.A．may rainB．might rainedC．must rainD．may have rained

They must have been enjoying themselves there, or they______so long.A．can"t have stayedB．w