9. Sometimes new ideas have to be tested many times before         . (accept)

有些時候新的想法必須經(jīng)過多次試驗后才能被接受。

9. being fully accepted/they are fully accepted before既可用作介詞,亦可用作連詞,因此,此處既可用從句結(jié)構(gòu),亦可用分詞短語,但都應為被動形式。

題目來源:高考英語組合訓練多項選擇+完成句子 > 組合訓練37-38

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