— The problem is very difficult. I'm afraid you can't wor..

— The problem is very difficult. I'm afraid you can't work it out.— _____ or not I can succeed, I'll have a try.A. If B. SinceC. Whether D. As

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Simon thought his computer was broken _____ his little broth..

Simon thought his computer was broken _____ his little brother pointed out that he had forgotten to turn it on.A. until B. unless C. after D. because

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Bob is determined to get a seat for the concert _____ it mea..

Bob is determined to get a seat for the concert _____ it means standing in line all night for the ticket.A. so that B. as if C. even though D. however

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Kids are not allowed to leave kindergartens _____ their pare..

Kids are not allowed to leave kindergartens _____ their parents come to pick them up.A. since B. unless C. althoughD. because

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Experts are trying to work out a plan to deal with the probl..

Experts are trying to work out a plan to deal with the problems caused by global warming _____ it is too late.A. when B. ifC. beforeD. until

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