问题
选择题
His parents thought he was working very hard in the room, _____in fact, he was chatting with his friends on the Internet.
A．when
B．where
C．which
D．while
答案
答案：D
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His parents thought he was working very hard in the room, _____in fact, he was chatting with his friends on the Internet.
A．when
B．where
C．which
D．while
答案：D