:He___(hear) on the radio that there was a traffic jam so he___(take) the MTR.

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:He___(hear) on the radio that there was a traffic jam so he___(take) the MTR.

:He___(hear) on the radio that there was a traffic jam so he___(take) the MTR.
:He___(hear) on the radio that there was a traffic jam so he___(take) the MTR.

:He___(hear) on the radio that there was a traffic jam so he___(take) the MTR.
had heard took

had heard took

heard
took

heard took
这两个半句都有自己完整的成分,所以可以各自看成是独立的句子,所以时态应一致。用一般过去时。

had heard
took
前面是过去完成时,后面是一般过去时,他听到了以后才去管理交通的

1.2.5 楼正解
用had heard是强调他听过广播后,才去做地铁的.