作业帮9.You should have to stay behind if your homework__before five o'clock.A.isn't done B.won't be done C.doesn't do D.wasn't done
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9.You should have to stay behind if your homework__before five o'clock.A.isn't done B.won't be done C.doesn't do D.wasn't done
9.You should have to stay behind if your homework__before five o'clock.
A.isn't done B.won't be done C.doesn't do D.wasn't done
9.You should have to stay behind if your homework__before five o'clock.A.isn't done B.won't be done C.doesn't do D.wasn't done
选A
此句为if引导的条件状语从句结构;1．if从句用一般现在时,主句用一般将来时
If he runs he’ll get there in time.如果他用跑的,他就会及时赶到那儿.
The cat will scratch you if you pull her tail.如果你拉猫的尾巴,它就会抓你.
2．if从句用一般现在时,主句用may/might/can
If the fog gets thicker the plane may/might be diverted.如果雾在大一些,飞机可能就会改在别的机场降落.
If it stops snowing we can go out.如果雪停了,我们就可以出去.
3．if从句用一般现在时,主句用must/should
If you want to lose weight you must/should eat less bread.如果你想减肥,你必须少吃面包.
4．if从句用一般现在时,主句用一般现在时
If you heat ice it turns to water.(也可用will turn)如果把冰加热,它就会化成水.
5．if从句用现在进行时,主句用一般将来时
If you are looking for Peter you’ll find him upstairs.如果你是在找彼得,上楼就会找到他.
6．if从句用现在完成时,主句用一般将来时
If you have finished dinner I’ll ask the waiter for the bill.如果你吃完了,我就叫服务生来算账
这句话是第三个用法
翻译如下;
如果你的作业在五点钟前未完成,你必须留下来
科技英语强手团
B，使用正常时态即可
希望这一回答对你有所帮助
A主将从现，主句用了情态动词，那就不用用将来时的，但是从句还是要用一般式，故选A