21、____ is the case with humans, animals also love their babies.
A. Which B. When C. What D. As
21、D
解析：定語(yǔ)從句.此處as是關(guān)系代詞，引導(dǎo)非限制性定語(yǔ)從句，且在從句中做主語(yǔ).which引導(dǎo)非限制性定語(yǔ)從句時(shí)，不能置于句首.
科目：高中英語(yǔ) 來(lái)源： 題型：
____ is the case with humans, animals also love their babies.
A. Which B. When C. What D. As
科目：高中英語(yǔ) 來(lái)源：2010屆高考英語(yǔ)二輪復(fù)習(xí)跟蹤測(cè)試：定語(yǔ)從句專題 題型：單項(xiàng)填空
____ is the case with humans, animals also love their babies.
A. Which B. When C. What D. As
科目：高中英語(yǔ) 來(lái)源：必修二導(dǎo)練英語(yǔ)外研 外研版 題型：014
________ is the case with humans, animals also love their babies．
A．Which
B．When
C．What
D．As
科目：高中英語(yǔ) 來(lái)源：訓(xùn)練必修五英語(yǔ)外研版 外研版 題型：016
________ is the case with humans, animals also love their babies．
Which
When
What
As
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