单项选择题

______ the explosion occurred was that the laboratory attendant had been careless.

A. That
B. What
C. Why
D. How
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单项选择题
He was ______ to tell the truth even to his closest friend.
A. too much of a coward

B. too much the coward
C. a coward enough

D. enough of a coward
单项选择题
The woman over there is none other than ______ mother.
A. Julia and Mary


B. Julia and Mary’s
C. Julia’s and Mary’s

D. Julia’s and Mary
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