题目内容
11．People throughout the world _______ together now to protect the natural environment．（ ）| A． | are working | B． | worked | C． | will work | D． | have worked |
分析 世界各地的人们现在为保护自然环境而共同工作．
解答 答案为A．短语work together是固定搭配，意思是合作，共同工作，句子中now表示现在的意思，故从now得知句子要用现在时进行时，to protect the natural environment的意思是保护自然环境，保护环境这一行动是一直在进行中，故可以得知句子要用现在进行时态，现在进行时态是am/is/are+动词的ing形式，work的动词ing形式为working，故答案为A．
点评 这一题学生学会判断句子要用哪一种时态，然后要掌握现在进行时态的规则，然后就可以得知答案．
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