(答案:B could,表示非真实的假设)
Victor obviously (A) doesn’t know what’s happened (B)otherwise he didn’t make (C) such a (D) stupid remark.
(答案:C wouldn’t have made, otherwise连接虚拟分句)
Without (A) the friction between their (B) feet and the ground, people will (C) in no way (D) be able to walk.
(答案:C would,介词without引导虚拟条件)
So great (A) was (B) the influence of Thomas paine on (C) his own time that John Adams suggested that the era was called (D) "The Age of Paine".
(答案:D be called, suggest后接宾语从句,其谓语应用动词原形)
Emphasis is laid on (A) the necessity that all the objectives to be attained (B) take into (C) account before starting (D) a new project.
(答案:C be taken into, necessity后接同位语从句,其谓语应用动词原形)
It (A) is essential that (B) all these figures are to be (C) checked twice (D) . (答案:C be,形容词essential要求其主语从句的谓语用动词原形)