[ Adjectives with Preposition ]
The teachers are worried ______________ their students
A. of
B. at
C. in
D. about
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Vocabulary › Viewunaware of; unconcerned; inattentive
A. spontaneous
B. dogged
C. keen
D. oblivious
Present Perfect › View
Why ______ (Elena, not try) other treatments for her back pain?
A. has Elena not tried
B. did Elena not try
C. is Elena not trying
D. does Elena not try