Since the calculators were introduced, they ... to be...
Clarymond Simbolon
6 bulan yang lalu
Since the calculators were introduced, they ... to be useful tools for people weak in math.
A.
Will proved
B.
Proved
C.
Have proved
D.
Are proving
Jawaban: C
Pembahasan:
Present Perfect
Since + S. Past → Present Perfect.
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Kategori:
TOEFL
Grammar
Tense