I ______ (study) non-stop ______ 9:15.
A. I have studied non-stop since 9:15.
B. I have studied non-stop for 9:15.
C. I has study non-stop since 9:15.
D. I has study non-stop for 9:15.
Zero ConditionalLater vs. LatterRegular vs. Irregular Verb
Next quiz: Mixed General Quiz
The logging industry is carried ___ principally in the Adirondack Mountains.
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