The expert offered us another piece of advice,_____of great help to our program.
题型：不详难度：来源：
The expert offered us another piece of advice,_____of great help to our program. | A．I think it is | | B．I think which is | | C．which I think it is | | D．which I think is |
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答案
| D |
解析
| I think 为插入语，干扰了定语从句结构的判断，从句中缺少主语，不能省略。故选D。 |
举一反三
The Science Museum,_____we visited during a recent trip to Britain, is one of London’s touristattractions.| A．which | B．what | C．that | D．where |
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I like to go shopping at the weekdays,_____the shop isn’t crowded. | A．which | B．when | C．that | D．where |
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The reason_____the manager explained at the meeting sounds reasonable.| A．which | B．what | C．why | D．for which |
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There is a mountain_____the top is always covered with snow. | A．whos | B．of which | C．its | D．that |
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_____has happened many times, children may get drowned in this river. | A．As | B．Which | C．What | D．That |
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