语法与词汇
Since the earliest ancestors of the whales were land creatures, the question has arisen as to how _________.无
A、
did the flipper adaptation of the whale originate.
B、
was the flipper adaptation of the whale originated.
C、
the flipper adaptation of the whale originated.
D、
the flipper adaptation of the whale to originate
【正确答案】
C
【答案解析】
句意： 因为鲸鱼最早的祖先是陆生动物， 所以它们的鳍足是如何演变的成为了一个问题。 从句一般用陈述语序， 故A、 B两项不正确。 从句也必须是完整的句子， 故D项错误。
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