21.Without more coal the fire, it would soon go out. A.added to; or B.added to; X C.added up to; and D.added up; for 【查看更多】

 

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Without more coal __________ the fire, ________ it would soon go out.

A.added to; or                                              B.added to; X

C.added up to; and                                         D.added up; for

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