题目内容
(请给出正确答案)
[主观题]
Some cities have passed laws that allow coal and oil______only if their sulfur content is
low.
A.burning
B.to burn
C.being burned
D.to be burned
提问人:网友lwjjjj
发布时间:2022-01-07
A.burning
B.to burn
C.being burned
D.to be burned
A. burning B. to burn
C. being burned D. to be burned
A.unless
B.until
C.when
D.while
A.have found
B.will be finding
C.will have found
D.are finding
A.For
B.Since
C.Before
D.While
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