So difficult ___it to work out the problem that I decided to ask Tom for advice．
| A．I did find | B．did I find | C．I have found | D．have I found |
相关试题
．（山东卷28）. The school rules state that no child shall be allowed out of the school during the day, ______ accompanied by an adult.
| A．once | B．when | C．if | D．unless |
．（辽宁卷29）. The old man asked Lucy to move to another chair _______ he wanted to sit next to his wife.
| A．although | B．unless | C．because | D．if |
（江西卷22）.— Our holiday cost a lot of money.
— Did it? Well, that doesn`t matter you enjoyed yourselves.
| A．as long as | B．unless | C．as soon as | D．though |
. Tim is in good shape physically__________ he doesn’t get much exercise.
| A．if | B．even though | C．unless | D．as long as |
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