[ Grammar ]
Listen! The birds ___ outside our window.
A. are singing
B. sing
C. sang
Select your answer:
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Present Perfect Continuous Tense › ViewShe … with the research team since January.
A. have been working
B. has been working
Preposition › View
Wood ……… such trees as pine and aspen is the most widely used source of pulp ………. paper.
A. in/out of
B. of/with
C. around/on
D. From/for