Bob would have helped us yesterday, but he ____________. A．is busy B．had been busy C．has b
Bobwouldhavehelpedusyesterday,buthe____________.A．isbusyB．hadbeenbusyC．hasbeenbusyD．w...
Bob would have helped us yesterday, but he ____________. A．is busy B．had been busy C．has been busy D．was busy
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| ：考查虚拟语气中的时态。根据前一句Bob would have helped us yesterday中的yesterday说明这是对过去情况的虚拟。But后面的句子使用陈述语气，故使用过去时。句意：昨天Bob本可以帮助我们的，但是他太忙了。故D正确。 |
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