But for their common interests, they_____ cooperated so smoothly in the investigation of the case.
| A．could have | B．will not have | C．could not have | D．have not |
相关试题
He b
ehaves _______ he were better than us.
| A．even though | B．even if | C．as though | D．although |
The question of drug-taking is bound to(一定要) ______ at the next conference.
| A．come up | B．be come up | C．come up with | D．be coming up |
_______ and you will make rapid progress.
| A．Working hard | B．To work hard | C．Work hard | D．Worked hard |
Its Ann’s birthday tomorrow. Will you _____me in buying a present for her？
| A．remember | B．remind | C．join | D．attend |
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