单项选择题

The pressure ______causes Americans to be energetic, but it also puts them under a constant emotional strain.

A．to compete
B．competing
C．to be competed
D．having competed
<上一题 目录 下一题>
热门 试题

单项选择题
______, I must do another experiment.
A．Be it ever so late
B．It is ever so late
C．It be ever so late
D．So late it be ever
单项选择题
Since it is too late to change my mind now, I am______ to carrying out the plan.
A．obliged
B．committed
C．engaged
D．resolved
相关试题