In 1994, almost 200 years after the death of Wang Zhenyi, the International Astronomical ______ the contributions of the
barrier-breaking 18th-century astronomer and author of “Dispute of the Procession of the Equinoxes,” naming a crater on
Venus after her.
Union would ﬁnally acknowledge
Union to ﬁnally acknowledge
Union, having ﬁnally acknowledged
Union, ﬁnally acknowledging
Choice A is the best answer. It’s the only choice that offers a form of the verb “acknowledge” that can go with the subject
“International Astronomical Union” to make a complete sentence. This might seem like an odd use of “would,” but when
speaking from a point of view in the past, we can actually use “would” to express something that happened later. That’s the
case here: 200 years after Wang Zhenyi’s death, the IAU would ﬁnally acknowledge her contributions.
Choice B is incorrect. This choice creates a sentence fragment. There’s no main verb elsewhere in the sentence, so we need
a form of the verb “acknowledge” that can go with the subject “the International Astronomical Union” and serve as that main
verb. “To acknowledge” can’t do that. Choice C is incorrect. This choice creates a sentence fragment. There’s no main verb
elsewhere in the sentence, so we need a form of the verb “acknowledge” that can go with the subject “the International
Astronomical Union” and serve as that main verb. “Having acknowledged” can’t do that. Choice D is incorrect. This choice
creates a sentence fragment. There’s no main verb elsewhere in the sentence, so we need a form of the verb “acknowledge”
that can go with the subject “the International Astronomical Union” and serve as that main verb. The “-ing” form can’t do that.