( )you have worked out the first problem,you may go on to wo

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( )you have worked out the first problem,you may go on to work on the second
( )you have worked out the first problem,you may go on to work on the second
A.even if B.unless C.now that Dthough

C 既然,表原因
A 即使,表让步
B 除非,表条件
D 虽然,表让步
既然你已经做出第一道题了,现在可以做第二道了
再问： B.unless 为何不对？
再答：如果选B除非，应该说才除非你做对第一个题，否则就不能做第二题那后半句应该用否定 Unless you have worked out the first problem, you may not go on to work on the second
再问：那和时态 have worked out the first problem有没有影响？

( )you have worked out the first problem,you may go on to wo --Have you worked out the problem?--Not yet,but I___. Have you worked out the math problem yet? ----Have you worked out the troublesome problem yet ----Have you worked out the problem,Sam ----Not yet ,but I__ you are great .you have worked out the problem__(success) 填词.Have a look first,or you may go the wrong way and have an can you show me the way ___ you worked out the problem.A,tha can you show me the way ___ you worked out the problem. Have you found the best way to work out the problem同义句Have y It's ( )to work out this problem .You needn't go to the teac It is_______ to work out this problem .You needn't go to the