要查看数据库中有哪些存储函数，可以使用______ FUNCTION STATUS命令。
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下列哪个叙述是不正确的？
A. String类是final类，不可以有子类。
B. String类在java.util包中。
C. "abc"=="abc"的值是false.
D. "abc".equals("Abc")的值是true
I'm writing to______ my thanks.
A. expressing
B. express
C. expressed
D. expressive
I wrote a letter to the headmaster and looked forwardto______him.
A. hear from
B. heard from
C. hearing from
D. to hear from
I need to______my shirt because it's dirty.
A. washes
B. washed
C. wash
D. washing
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