单项选择题

(That) troubles me is (that) I can't learn (all these) English idioms (by heart).

A．That
B．that
C．all these
D．by heart
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单项选择题
Without a passport, leaving the country is ______.
A．in question
B．without question
C．out of the question
D．out of question
单项选择题
He might have been killed ______ the arrival of the police.
A．even if
B．if only
C．but for
D．as if
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