In 1968, chemist Spencer Silver attempted to create a super-strong adhesive but accidentally developed a low-tack, reusable pressure-sensitive adhesive instead. Years later, his colleague Art Fry ______ using the adhesive to anchor his bookmark in his hymnbook, giving birth to the Post-it Note.
3
readingWhich choice completes the text so that it conforms to the conventions of Standard English?
A
proposed
B
proposes
C
has proposed
D
is proposing
Correct Answer: A
Choice A is the best answer. The sentence narrates a sequence of events in the past ("Years later..."). The simple past tense "proposed" is consistent with the historical context established by "attempted" and "developed" in the previous sentence.