单项选择题

Television did not become very common（）the early 1960s.

A.unless
B.up to
C.onto
D.until

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It was in 2001（）my elder brother went to college.

A.when
B.that
C.in which
D.which
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We had a（）lesson in children education yesterday.

A.deep
B.profound
C.deeply
D.steep
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