1、Too much exposure to TV programs will do great harm to the eyesight of children. ______________________________________________________
2、Since nobody gave him any help, he ________ have done the research on his own
A.can
B.must
C.would
D.need
3、It is only when the stress gets out of control ______ it can lead to poor performance and ill health
A.when
B.until
C.that
D.before
4、Only after talking to two students ________ that having strong motivation is one of the biggest factors in reaching goals
A.I did discover
B.did I discover
C.I discovered
D.discovered
答案解析:
1.【答案】看太多的电视节目会严重损害孩子们的视力。(名词转动词)。解析:
2.【答案】B。解析:情态动词。can have done和need have done主要用于否定句和疑问句中;must have done表示对过去情况的肯定推测,意为“一定已经做了某事”;would have done表示与过去事实相反的假设。根据句意可知,此处表示的是对过去情况的肯定推测,所以应用must have done。故选B。
3.【答案】C。解析:考查强调句。句意:只有当压力太大时,才会导致糟糕的表现和健康问题。It is/was+被强调对象+that+其他。强调句的判别方法就是去掉It is/was…that然后调整语序后句子是一个完整的句子,那么这个句子就是一个强调句。故选C。
4.【答案】B。解析:考查部分倒装。only+状语位于句首时,句子要用部分倒装,将谓语的一部分(如助动词或情态动词)放至主语之前,故选B。
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