单项选择题

He is weak in grammar and sometimes can't even ______ a verb from a noun.

A．say
B．tell
C．speak
D．express
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单项选择题
They will be very thankful for ______ you can give them.
A．that
B．which
C．when
D．whatever
单项选择题
I happened ______ when the telephone rang.
A．rut
B．to be out
C．being out
D．be out
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