[ Tenses and Sentence Completion ]
I can’t understand ______ she is upset.
A. what
B. why
C. where
D. how

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Articles › ViewDid you study ….. physics at school?
A. a
B. an
C. the
D. zero article
Gerund › View
She avoided ________ out tonight
A. telling
B. told
C. telt
D. tells
