请在第(49)处选择正确答案______

单选题请在第(49)处选择正确答案_______

A．that
B．which
C．what
D．how

参考答案A

解析:A。考查同位语从句。空格后面的从句作句子主语concem的同位语，所以引导词用that。

单选题请在第(50)处选择正确答案_______

A．assure
B．guarantee
C．ensure
D．secure

单选题They lost their way in the forest, and ________made matters worse was that night began to fall．

A．that
B．it
C．what
D．which

单选题 The business of each day, ________selling goods or shipping them, went quite smoothly．

A．it being
B．be it
C．was it
D．it was