单项选择题

Children begin to communicate by making noises ______ they are able to speak a language.

A．before long
B．long before
C．long ago
D．long after
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单项选择题
There ______ nothing to discuss further, the chairman got to his feet, then left the meeting room.
A．leaving
B．having
C．being
D．is
单项选择题
Quizzes are given every other week to make sure that the students ______ keeping in pace with what is going on in the class.
A．are to be
B．will be
C．shall be
D．are
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