Experiments of this kind _______ in both the U.S. and Europe well before the Second World War.(2011北京卷21)
A.have conducted |
B.have been conducted |
C.had conducted |
D.had been conducted |
But for electricity, human life _____ so easy today.
A.isn’t | B.would not be | C.will not be | D.would not have been |
We ___ to start our own business, but we never had enough money.
A.have hoped | B.had hoped | C.would hope | D.should hope |
—We could have walked to the doctor’s; it was so near.
—Yes. A ride ___ at all necessary.
A.wasn’t | B.hadn’t been | C.wouldn’t be | D.won’t be |
— Are you going to the ball tonight? —It’s too late now. How I wish ___ about it earlier.
A.I’ll know | B.I’ve known | C.I know | D.I’d known |
_____ the fog, you would find the beautiful tower in the distance easily.
A.Had it not been for | B.I at were not |
C.If it had not been for | D.Were it not for |