单项选择题

A baby might show fear to an unfamiliar adult,______ he is likely to smile and reach out to another infant.

A．if
B．whenever
C．whereas
D．because
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单项选择题
All the staff members of the department made______ efforts to clean up the hall for the Christmas party.
A．gigantic
B．concerted
C．comprehensive
D．conscientious
单项选择题
The house______ ready today but there has been a builders' strike it is still only half finished.
A．was to be
B．was to have been
C．were to be
D．should be
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