We all know laws to discourage the use of plastic bags _______ in many parts of the world.
A．passedB．have passedC．had been passed D．have been passed
D
考查動(dòng)詞的時(shí)態(tài)。句意為“我們都知道不提倡使用塑料袋規(guī)定已經(jīng)在世界許多地方通過(guò)”。主語(yǔ)為laws，用被動(dòng)是一定的。根據(jù)語(yǔ)境可知用had been passed明顯錯(cuò)誤，只有D可以理解。此處用were passed也可。完成時(shí)態(tài)與過(guò)去時(shí)態(tài)的理解和辨析一直是高考重點(diǎn)，同時(shí)也是學(xué)生的難點(diǎn)。
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