No chicken or duck ______ in the supermarket since the first case of H7N9 was re
题型：不详难度：来源：
No chicken or duck ______ in the supermarket since the first case of H7N9 was reported dead.| A．has been sold | B．was sold | C．is sold | D．are sold |
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答案
| A |
解析
试题分析：考查时态：句意：自从第一个H7N9病例被报告后，没有人吃鸡鸭。和since引导的时间状语从句连用，主句的谓语是现在完成时，No chicken or duck和sell是被动关系，用现在完成时的被动，选A。
点评：英语中的时态主要由动词的形式决定，因此在学习英语时态时，要注意分析动词形式及具体语境，想象在那个特定的时间动作所发生的背景，这个动作是经常性动作、一般性动作、进行性动作、完成性动作还是将要发生的动作。 |
举一反三
"I"m more nervous right now than when I ______," Jane said, as she saw the group of reporters waiting anxiously at the exit of the gym.| A．had competed | B．compete | C．was competing | D．have competed |
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--- I hope you enjoyed the film last night.
-----How on earth do you know I went to a film? I ________ you.| A．won’t tell | B．didn’t tell | C．haven’t told | D．hadn’t told |
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It won’t be too long before we_____a way to smooth away these difficulties.| A．work out | B．willworkout | | C．had worked out | D．are working out |
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---Have you seen Jane this week?
---No, but I ________ her call on my way to work this morning.| A．received | B．have received | C．had received | D．was receiving |
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With the rise of modern communication tools, handwritten letters ______ by emails. | A．will replace | B．have replaced | C．are replaced | D．are being replaced |
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