The pressure________causes Americans to be energetic, but it also puts them under a constant emotional strain.
A) to compete C) to be competed B) competing D) having competed
结合选项看,全句的意思是:竞争的压力使美国人精力充沛,但也使他们的精神始终处于紧张状态。名词pressure后应加不定式做定语,说明 pressure的内容。因此本题答案是A) to compete。选项B) competing是现在分词;D) having competed现在分词的完成式,都不符合语法规定。选项C) to be competed中的Compete是不及物动词,不能用被动语态,所以这三个选项都不正确。
介词+关系代词+不定式可以做定语用,这种用法是一种正式的表达法。我们看下面这个例子:
例:1995年6月四级第50题
You will want two trees about ten feet apart, from _____ to suspend your tent.
A) there B) them C) which D) where
全句的意思是:你将需要两棵相距约10英尺的树来挂你的帐篷。
本句中只有which是关系代词,因此答案是C。
10. 不定式做状语
例:1995年1月四级第48题
________ a teacher in a university, it is necessary to have at least a masters degree.
A) To become B) Become C) One becomes D) On becoming
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