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        1. _____ your help, we _____ complete the work in time.
          A.Thanks to; were able toB.Thanks to; could
          C.As; wouldD.Because; had to
          A
          thanks to相當于because of,此短語可放在句首或句尾,to是介詞,后接名詞、代詞或動名詞,而as或because后接的是從句,因此排除C、D,其次,當表示過去有能力并實際上成功地做到某事,要用“was/were able to”不用could,沒有做到可用couldn’t或wasn’t/weren’t able to.
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