单项选择题

Tom ______ better than to ask his brother to help at such a critical moment.

A．shall
B．has known
C．shouldn't
D．should have known
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单项选择题
Wilson stood dazed in the middle of Times Square, ______ of the crowds that surrounded him.
A．oblivious
B．capricious
C．precipitous
D．ubiquitous
单项选择题
______ with overwork and injury done him, the good man died of cancer.
A．Because
B．If
C．Since
D．What
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