23、(单选、2.5分) The teacher told his students that the earth___________round like a ball. A、be B、is C、had been D、was

23、(单选、2.5分)
The teacher told his students that the earth___________round like a ball.
A、be
B、is
C、had been
D、was

出自：河北工程技术学院大学英语1

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