填空题

When I got to classroom late, the class had already started and the teacher ______ (write) maths problems on the blackboard.

【参考答案】

had been writing
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单项选择题
A．The conference was held this morning.B．The conference was held last Tuesday.C．The conference was canceled.D．The conference was put of
A．The conference was held this morning.
B．The conference was held last Tuesday.
C．The conference was canceled.
D．The conference was put of
填空题
had to
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