. The boy was sitting at the desk, hard when his mother got home. A．to pretend to workB．to pretend to be workingC．pretending to workD．pretending to be working 题目和参考答案——青夏教育精英家教网—

题目内容

. The boy was sitting at the desk, ______ hard when his mother got home.

A．to pretend to work	B．to pretend to be working
C．pretending to work	D．pretending to be working

略

练习册系列答案

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