在英語中有些表示時間,條件,方式或者讓步等的從句有時可省略一些成分：如果從句的主語和主句的主語一致（或者從句的主語是it）,而且從句謂語中又包含be,那么這個主語和be動詞都可以省略.
When (he was) asked how he gained first place,he suddenly
became cheerful.
If (they are) operated by computer in the future,many of the
trains will have no drivers.
Although (it was) sold by a German company for the first time in 1899,aspirin has been around much longer than that.
They looked around the room as if (they were) looking for
something.
The boys will go out to play football whenever (it is) possible.
你的句子No matter how frequetly (the works are) performed,就屬于這種情況
No matter how frequetly _ the works of Beethoven always attract a large number of people.
No matter how frequetly _ the works of Beethoven always attract a large number of people.
A.performing
B.performed
C.to be performed
D.being performed
答案是 B
為啥?
A.performing
B.performed
C.to be performed
D.being performed
答案是 B
為啥?
英語人氣：468 ℃時間：2019-09-23 09:07:35
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