It still puzzles today's scientists_____ some mammals produce their young _____others lay eggs to producetheir offspring (后代). [ ]A. that; while B. what;-高中英语-n多题

◎ 题干

It still puzzles today's scientists _____ some mammals produce their young _____ others lay eggs to produce
their offspring (后代).

[ ]

A. that; while
B. what; while
C. that; as
D. what; as

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