[ Grammar ]
I can’t tell ___ the box is open. Can you take a look for me?
A. what
B. if
C. ╳
D. who

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English MorphosyntaxHave to / Do not have toPast Tense vs Present TensePossessive Adjectives VS Possessive PronounsModal and Auxiliary VerbsComparisonMiscellaneous Grammar UsagesInfinitive and GerundsVerb + InfinitiveEnglish ArticleOther quiz:
Vocabulary › View(adj.) not movable; not moving
A. immobile
B. impassable
C. minimum
D. nimble
Mixed General Quiz › View
The puppy had mud all over its ___.
a. pause
b. paws