题目内容
Our neighbor offered to look after our baby yesterday when we were busy, _____is often the case.
| A．it | B．that | C．which | D．as |
D
解析试题分析：考查定语从句。这里考查由as引导的非限定性定语从句，as在句中由“正如”之意。句意：昨天当我们都很忙的时候，我们邻居主动来照顾我们的婴儿，通常就是这样的。故D正确。
考点：考查定语从句
The engineer __________ my father works is about 60 years old.
| A．to whom | B．on whom | C．with whom | D．with which |
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| A．that | B．which | C．whose | D．what |
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| A．which | B．whom | C．whose | D．his |
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| A．whom | B．when | C．which | D．who |
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| A．how | B．which | C．where | D．when |
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| A．in whom | B．in them | C．of whom | D．of them |
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| A．from which | B．from where | C．where | D．which |
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| A．what | B．which | C．that | D．it |