四级语法系列练习－时态、语态(6)
时间：2019-01-11 作者：英语课 分类：英文语法词汇
16. It seems oil ____ from this pipe for some time. We'll have to take the machine apart to put it right.
A. had leaked
B. is leaking
C. leaked
D. has been leaking
17. Great as Newton was, many of his ideas ___ today and are being modified 1 by the work of scientists of our time.
A. are to challenge
B. may be challenged
C. have been challenged
D. are challenging
18. Sir denis, who is 78, has made it known that much of his collection __ to the nation.
A. has left
B. is to leave
C. leaves
D. is to be left
答案:
16. D
译文：看来这根管子漏油已有一段时间了，我们只好拆开机器来排除故障。
本句是现在完成进行时的用法。
17. C
译文：牛顿虽然伟大，但他的不少见解如今却受到挑战，并且为当代科学家的工作所修正。
本句是被动语态的完成时的用法。他的见解受到挑战，应用被动结构。从上下文来推断，自从牛顿的见解被提出以来，不断受到当今科学家的挑战，表示从过去某个时间延续到现在，还可能延续下去，所以要用完成时。
18. D
译文：78 岁的丹尼斯爵士已经向众人宣布将把他的许多收藏品献给国家。
本句是被动语态的将来时的用法。许多收藏品“被”丹尼斯捐献给国家，为一被动结构。从四个选项来看，只有D)符合题意。“be to ＋动词原形”所表示的将来时含有预定、义务、可能、命令或吩咐等。