问题
选择题
. 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
答案
答案：D
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. 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
答案：D