Choisissez la réponse la plus appropriée pour chaque question.
Question 1 :
In that period the Crommelyncks ________ more than 700 gravures for Picasso, often working through the night and proofing successive stages of each print so that Picasso could carry it further the following morning.
producing
produces
produced
produce
Question 2 :
The Magellan probe ________ a vast number of radar images of Venus.
producing
produces
produced
produce
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