单项选择题

He ______ another career but, at the time, he didn’t have enough money to attend graduate school.

A. might have chosen

B. must have chosen
C. might choose

D. had to choose

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单项选择题______ they must learn in a course is not provided in the classroom.

A. Many things

B. Much of what
C. So much

D. All of which

单项选择题The chief reason for the population growth isn’t so much a rise in birth rates ______ a fall in death rates as a result of improvements in medical care.

A. and
B. as

C. but

D. or