单项选择题

Living in the central American desert has its problems, ______ obtaining water is not the least.

A. of which
B. for what
C. as
D. whose
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单项选择题
You ______ yesterday if you were really serious about the job.
A. ought to come
B. ought to be coming
C. ought to have come
D. ought have come
单项选择题
Without the worker's help, Sam ______ so much progress.
A. would not make
B. would not have made
C. will not make
D. did not make
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