2、Professor Smith, along with his assistants, ____ on the project day and night to meet the deadline.
| A．work | B．working | C．is working | D．are working |
相关试题
Do you know where David is? I couldn’t find him anywhere.
Well, he have gone far. His coat is still here.
| A．shouldn’t | B．mustn’t | C．can’t | D．wouldn’t |
Oh, I’m not feeling well in the stomach .I so much fried chicken just now.
| A．shouldn’t eat | B．mustn’t have eaten |
| C．shouldn’t have eaten | D．mustn’t eat |
The naughty boy to me that the hen that there just now had two eggs the day before.
| A．laid; laid; laid | B．lied; lay; laid | C．laid; lay; lain | D．lied; laid; lain |
is even more important is the earth cooled down, water began to appear on its surface.
| A．When; that; when | B．What; whether; as | C．What; that; as | D．lt; whether;  as |
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