1、Ten days _____long enough for Mr Carter to finish his design.He doesn't need any more.
A、is B、has been C、was D、had been
2、"can I help you?""Well,I'm afraid the box is too heavy for you,_____thank you all the same."
A、and B、so C、or D、but
3、I visited Jiuzhaigou last antumn.Never in my life _____so beautiful a place like that.
A、I had seen B、did I see C、had I seen D、I shall see
以上答应分别是：ADC