[問題]PP-TEST2-113 ( structure)

[winrewqnie]

113. That brought about the widespread extinction of the
dinosaurs is unknown; it must, however, have involved
major changes in the environment.

ANSER:A
贊成..不過分號後面的虛主詞(It),為何搭配have.????

[duck]

既然看到It 還要看到後面的must喔!
must + 原形V.
有時候會miss, 所以要更細心喔

[micki]

winrewqnie,

下次請把類別標上.
這次先幫你加上 structure, 下次請按規定po文.