[ Tenses ]
This song is so good that I have been listening to it ____ 4 hours.
A. for
B. since
C. at
Select your answer:

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Sentence Structure and Conjunctions › ViewDetermine the structure of the following sentence:
He opened the mailbox and the front door.
A. simple sentence
B. compound sentence
C. complex sentence
D. compound-complex sentence
Tenses › View
Choose either the simple present or the present progressive form for the verbs in parentheses. Most students (make) career plans before they graduate.
A. make
B. are making
