答案ring
解析：hear sb.+ do 或doing
沒有hear sb.do to結(jié)構(gòu)
We were having breakfast when I heard the telephone _____(ring).
We were having breakfast when I heard the telephone _____(ring).
ring
to be ring
to be ringing
這三個(gè)填法有何不同,
ring
to be ring
to be ringing
這三個(gè)填法有何不同,
英語人氣：357 ℃時(shí)間：2020-06-14 02:03:57
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