The environment will be further polluted unless some measures _____.
A．a(chǎn)re takenB．will be taken
C．a(chǎn)re being takenD．should be taken
A

試題分析：考查時態(tài)：句意：環(huán)境將被進(jìn)一步污染，除非一些措施被采取。主句是一般將來時，Unless引導(dǎo)的是條件狀語從句，用一般現(xiàn)在時代替將來時。選A。
點評：時態(tài)題的考查關(guān)鍵是抓住句子的上下文含義和句中的時間狀語。要根據(jù)時間狀語來選擇合適的時態(tài)，在平時的學(xué)習(xí)中要注意積累有關(guān)時態(tài)的用法和各種時態(tài)的特殊之處。注意時間條件狀語從句不能用一般將來時，應(yīng)該用一般現(xiàn)在時代替一般將來時。
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