问题
选择题
Sally is busy ______ her homework.
A．in
B．at
C．with
D．on
答案
答案：C
考查固定结构。Be busy with sth.忙于某事；be busy doing sth.忙于做某事。所以选 C。
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Sally is busy ______ her homework.
A．in
B．at
C．with
D．on
答案：C
考查固定结构。Be busy with sth.忙于某事；be busy doing sth.忙于做某事。所以选 C。