______ some of this juice perhaps you'll like it.
A. [A] Try
B. [B] Trying
C. [C] To try
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Since I began to work here three years ago, this factory ______ in size.
A. [A] had doubled
B. [B] has doubled
C. [C] doubled
维生素D缺乏性佝偻病骨骼改变正确的是
A. 1岁出现方颅
B. 1岁半时前囟闭合
C. 颅骨软化多见于6个月以上小儿
D. 下肢畸形见于8个月小儿
E. 出牙延迟至1岁或更晚
We won't go to the Great Wall if ______.
A. [A] it rains
B. [B] it will rain
C. [C] it is raining
When my grandpa became ill, my father ______ the doctor at once.
A. [A] sent for
B. [B] asked for
C. [C] looked for
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