Before the first nonstop flight made in 1949, it_____ necessary for all planes to land for refueling.
| A．would be | B．has been | C．had been | D．would have been |
相关试题
One of the best ways for people to keep fit is to______ healthy eating habits.
| A．grow | B．develop | C．increase | D．raise |
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series
| A．serious | B．reception | C．energetic | D．equal |
feast
| A．breast | B．league | C．measure | D．wealthy |
insurance
| A．usual | B．usage | C．suitcase | D．ensure |
exist
| A．express | B．extremely | C．exactly | D．exit |
oxygen
| A．genuine | B．gravity | C．garlic | D．glory |
Our teacher looked here and there on our playground _______ looking for something.
| A．even though | B．even if |
| C．only if | D．as if |
Progress so far has been very good._________ , we are sure that the project will be
completed on time.
| A．however | B．Otherwise | C．Therefore | D．Besides |
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