单项选择题

He had overslept, ______ he was late for work.

A. so that
B. since
C. because
D. as
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We’ve tested three hundred types of boot, ______ is completely waterproof.
A. no of which
B. none of which
C. some of that
D. neither of which
单项选择题
The buses, ______ were already full, were surrounded by an angry crowd.
A. most of which
B. both of which
C. few of them
D. those of which
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