单项选择题

The millions of calculations (involved) , (had they) been done by hand, would (lose) all practical value (by the time) they were finished.

A．involved
B．had they
C．lose all
D．by the time
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单项选择题
The ballad (is characterized) by informal diction, by a narrative largely (dependent on) action and dialogue, by thematic (intense), and by (stress) on repetition.
A．is characterized
B．dependent on
C．intense
D．stress
单项选择题
The manufacture of (automobile) was (extremely) expensive (until) assembly-line techniques (made) them cheaper to produce.
A．automobile
B．extremely
C．until
D．made
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