[ Present Tenses and Vocabulary ]
I think ………….. this grammar question now.
A. am understanding
B. understand

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Vocabulary › ViewExert
A. to apply a force
B. to receive a force
C. the same in quantity, size, degree, or value
D. different in quantity, size, degree, or value
Grammar › View
He ______ (be) in Mexico ______ a month.
A. He has been in Mexico for a month.
B. He have been in Mexico since a month.
C. He has be in Mexico for a month.
D. He has be in Mexico since a month.