The group’s research has done much to our knowledge of the HIV virus．
| A．advance | B．pull | C．rush | D．adopt |
相关试题
．He’s unlucky, and he’s always suffering _____ luck one after another．
| A．a sick | B．an ill | C．sick | D．ill |
．A computer is so useful a machine ________ we can use everywhere．
| A．that | B．whic h |
C．as | D．what |
He ________ the window of our classroom yesterday because he didn’t come to school．
| A．mustn’t have broken | B．mightn’t have broken |
| C．shouldn’t have broken | D．couldn’t have broken |
Mary had promised to give me a ticket for tomorrow．She failed, ____．
| A．either | B．though | C．but | D．too |
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