[ Grammar ]
I faced many troubles ——-my visit to Riyadh.
A. while
B. during
C. when
D. at

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Conjunctions › View__________her laziness, she failed the exam.
A. Because
B. Because of
C. Though
D. However
Grammar › View
Last year, you might have been _________ about mass production.
A. learn
B. learnt
C. learned
D. learning