In order to meet the demands they had to________production.
A.fasten up   B.rise up
C.speed up   D.go up
C
考察固定詞組。Speed up加速;fasten up扣上;rise up上升;go up上升;結(jié)合句意可知C正確。句意:為了滿足需求,他們不得不加快生產(chǎn)。
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