[ Grammar ]
I didn’t meet him yesterday. He _______ on business.
A. must go
B. should go
C. must have gone
D. should have gone

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Past Perfect and Past Perfect Continuous TenseSubjunctivesAdjective and AdverbTOEFL Adjective and AdverbConditional Sentence Type 2 and Type 3Too or EnoughPossessive Adjectives VS Possessive PronounsAdverbial Clause / If / ComparativesConjunctions and CommasModals and ConditionalsOther quiz:
Grammar › ViewSwitzerland is one of __________ (rich) countries in the world.
A. rich
B. richer
C. the richest
D. as rich
Vocabulary › View
a brightly colored tropical bird that is often kept as a pet
A. ground
B. parrot
C. neighbor
D. panic