We’ll climb the mountain _______ the weather is bad this weekend.A．ifB．whenC．unt
题型：不详难度：来源：
We’ll climb the mountain _______ the weather is bad this weekend.| A．if | B．when | C．until | D．unless |
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答案
| D |
解析
试题分析：句意：我们将会爬山,除非这个周末天气不好。IF是如果的意思，如果结果是肯定的那么IF后面引导的从句（从句在主句前面用逗号隔开）用一般现在时，而主句也用一般现在时。如果结果是可能的主句（从句用一般现在时）就用一般将来时。UNLESS相当于IF NOT就是如果不/除非的意思用法和刚才IF用的一样。总结：结果是肯定的就主现（在时）从现（在时）结果是可能的就是主将从现啦。无论结果是肯定的或可能的从句都是一般现在时而变化的是主句！故选D |
举一反三
| Although he is a little boy,_____he speaks English well. |
— What shall we do now?
— __________ it’s raining hard, let’s stay at home.| A．So | B．Since | C．Though | D．Otherwise |
|
—_____________________?
—She is a nurse.| A．Who is your mother? | B．Is your mother a nurse? | | C．Where is your mother？ | D．What does your mother do？ |
|
They didn’t go to bed ________ they finished their homework.| A．when | B．because | C．until | D．if |
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—Do you like math?
—Yes, it’s difficult ________ really interesting. |
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