单项选择题

Li Lei didn't meet the famous American professor ______ he was on holiday last year.

A．unless
B．until
C．if
D．whether
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—How many guests are there in the room—15, ______ two children.
A．include
B．including
C．included
D．is included
单项选择题
She is the one among the women writers ______ comic books for children.
A．whom writes
B．whom write
C．who write
D．who writes
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