It was quite a long time__________I made it out what had happened.A．afterB．befo
题型：不详难度：来源：
It was quite a long time__________I made it out what had happened.| A．after | B．before | C．when | D．since |
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答案
| B |
解析
| 在“It+be+时间名词+before/since”从句句型中，连词before与since极易混淆。用before引导时，句意是“过了多久才……”，主句中的be动词为过去时或将来时态；用since引导时，其句意是“自从……以来已经很久了”，主句中的be动词多为现在时（或现在完成时）或一般过去时（此时since从句要用过去完成时）。 |
举一反三
In my opinion，his suggestion__________right or not，should be considered.| A．if | B．which | C．when | D．whether |
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_________，so he didn’t come to school last week.| A．Though he was ill | B．Being ill | | C．Having been ill | D．He was ill |
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__________ you go，you should bear the motherland in mind.| A．Where | B．Whenever | | C．However | D．Wherever |
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Plants grow best__________it is warm and wet.| A．which | B．in which | C．where | D．that |
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__________ problems you have，you can always come to me for help.| A．What | B．Whatever | | C．Whenever | D．Which |
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