摘要：30．It still puzzles today’s scientists some mammals produce their young others lay eggs to produce their offspring ． A．that; while B．what; while C．that; as D．what; as
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It still puzzles today’s scientists ______ some mammals produce their young ______ others lay eggs to produce their offspring( 后代)
|
A．that; while |
B．why; while |
C．how; when |
D．what; as |
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It still puzzles today’s scientists ______ some mammals produce their young ______ others lay eggs to produce their offspring( 后代
- A.that; while
- B.why; while
- C.how; when
- D.what; as
It still puzzles today's scientists _____ some mammals produce their young _____ others lay eggs to produce
their offspring (后代).
their offspring (后代).
[ ]
A. that; while
B. what; while
C. that; as
D. what; as
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B. what; while
C. that; as
D. what; as