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正确答案：B
答案讲解：根据时间状语up to now（直到现在），我们可知本句的动词应用完成时态，所以答案为B，意思是“到目前为止我还不是很成功”。
15、The wheat ____________cut three days ago.
A. were B. has been C. Had D. was 正确答案：D 答案讲解：短语three days ago是一般过去时的时间状语，主语the wheat是不可数名词，所以应选D，意思是“麦子三天前就割了”。
Unit 3 将来时
1 One____________if one breaks the law.
A. will be punished B. will punish C. is being punished D. has been punished 正确答案：A
答案讲解：one 和punish之间是被动关系，应用被动语态。根据条件状语从句if one breaks the law可知punish这个动作没有发生，应该用一般将来时，所以答案为A，意思是“如果一个人触犯法律，就会受到惩罚”。
2、If you____________quiet, I'll tell you what happened. A. be B. are to be C. are D. will be 正确答案：C
答案讲解：如果主句是一般将来时，在条件状语从句中，通常用一般现在时代替一般将来时，所以本题应选C，意思是“如果你安静下来，我就告诉你发生了什么”。 3、Middle school boys____________not to smoke.
A. always tell B. are told always C. are always told D. is always told 正确答案：C
答案讲解：主语middle school boys是复数，而且与谓语动词tell之间是被动关系，这样可以排除A和D。副词always应该放在助动词和实义动词之间，所以应该选C，意思是“中学男生总是被告知不要抽烟”。
4、If you study hard, you____________the examination.
A. has passed B. are passing C. have passed D. will pass 正确答案：D
解析：分析句意，即“如果你好好学习，你就会通过考试”，可知pass这个动作还没有发生，应该用一般将来时，所以选D。
5、John does a lot of housework every evening, but now he ____________his schoolmates with their lessons.
A. help B. is helping C. helps D. has helped 正确答案：B
答案讲解：根据but后面的时间状语now可知这一动作正在进行中，应该用现在进行时，所以选B，意思是“约翰每天傍晚做很多的家务活，但是现在他正在帮助他的同学们复习功课”。 6、The song ____________by children.
A. is often sung B. was often sung C. sings D. has often sung 正确答案：A
答案讲解：主语the song 是单数，和谓语动词sing之间是被动关系，而副词often表明是经常发生的动作，应用一般现在时，所以答案为A，意思是“孩子们经常唱这首