c 必須的!為什么？謝謝！be busy doing sth 其實也可以是 be busy (in) doing sth. 意為忙于做某事。
be busy to do sth.如果是 be too busy to do sth.
那就是too...to...結(jié)構了，可以這樣用，太忙了以至于不能干什么。
work on 的work做名詞才是
所以c
He didn't answer the phone immediately as he was ( ) on a difficult maths problem.
He didn't answer the phone immediately as he was ( ) on a difficult maths problem.
A.busy to work B.busy with work C.busy working D.busying
A.busy to work B.busy with work C.busy working D.busying
英語人氣：290 ℃時間：2020-04-04 12:50:53
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