单项选择题

He didn't come yesterday. He ______ busy working in the lab.

A．must be
B．would have been
C．must have been
D．would be
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单项选择题
It is said that he ______ murder.
A．committed
B．conducted
C．executed
D．emitted
单项选择题
Living in the central American desert has its problems, ______ obtaining water is not the least. A. of which t3. for what C. as D. whose
A．as
B．whose
C．t3. for what
D．Living in the central American desert has its problems, ______ obtaining water is not the least.
E．of which
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