[ Grammar ]
Choose the correct verb tense for the underlined phrase. “However, Mei has described things we never knew!”
A. present perfect
B. past perfect

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Grammar › ViewI discovered he …… it correctly.
A. Hasn’t done
B. Hadn’t done
Grammar › View
What kind of verb is have? The teachers have a lot of pets.
A. action
B. linking
C. helping/auxiliary
