111. _____ mandatory to wear a lab coat and safety goggles at all times in the laboratory.
(A) There is
(B) There has
(C) It’s
(D) Its

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統計： A(49), B(32), C(386), D(10), E(0) #3079619

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#5907891
在實驗室裡，它是強制穿實驗室大衣和一直...
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