[ Grammar ]
3-D printing ____ complex tools and components.
A. is used for produce
B. is used to produce
C. uses for producing
D. uses to produce

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Demonstrative PronounDefinite ArticlesFuture Tense and ConditionalsWish / If only ( Present)Prepositions and Preposition PhrasesCommon & Proper NounsPresent simple or Past simplePronoun Antecedent AgreementEd and Ing EndingsGrammar & ReadingOther quiz:
Phrasal Verbs › ViewMike hasn’t turned up yet. Do any of you know where is he?
A. Turn Up
B. Give Up
C. Turn Out
Past Tenses › View
to give a series of actions in the order that they happened
A. past simple
B. past continuous