单项选择题


A．If
B．Although
C．When
D．Unless
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单项选择题
A．hardlyB．unwillinglyC．mostlyD．usually
A．hardly
B．unwillingly
C．mostly
D．usually
单项选择题
A．now and thenB．day and nightC．up and downD．over and over
A．now and then
B．day and night
C．up and down
D．over and over
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