单项选择题

He ______ have been nervous because he didn’t go straight in.

A．ought to
B．must
C．should
D．had to
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单项选择题
The earnings of women are well below that of men ______ educational differences that are diminishing between the two sexes.
A．although
B．though
C．despite of
D．in spite of
单项选择题
She always put her medication on the top of the shelf lest the children ______ it by mistake.
A．took
B．should take
C．had taken
D．would take
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