四选一,句子分析,如下：

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四选一,句子分析,如下：
1.---do you think the thief entered through the window?
---no,if he had,I don't believe,___broken the living-room's window.
A.he would have B.he must have C.he had D.should he have
我选的是A,不明白为什么要用到装,又没有省略if,求分析.
2.as your instructor advised,you ought to spend your time on something___researching.
A.worhtwhile B.worth C.worthy D.requesting.
为什么C不对,求分析.
3.some of the most important concepts in physics ___their success to these mathematical systems.
A.oblige B.owe C.contribute D.attribute
我第一反应选的C,own to:归功于,由于；contribute to：有助于、有利于
不明白这句话的意思,求翻译,此外,为什么C不对,
4.are there any ___ for believing that there is life on other planets?
A.facts B.foundations C.grounds D.bases
为什么A不对,求翻译,求分析.
5.——sales of beef in China will increase.
A.it is reported when B.it reports that
C.it has been reported that D.it is reporting that
B为什么不对,求分析.

1.相当于反义疑问句,如果贼是从窗户进来的,那他不是应该打碎卧室的窗子吗?
2sth worth doing词组,值得做
3,一些重要的物理原理/概念的成功归功于这些数学体系
4,是否有任何理由/证据证明其他星球上有生命?
5,reported 做动作在说的时候已经发生完了,要用完成时态.这不是虚拟语气,不能遵从主将从现原则.

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