题目:
—Mary can't help you _______ the house. Why?
—Because she is busy _______ a hotel reservation. [ ]
A. to clean; making
B. cleaning; making
C. cleaning; to make
D. to clean; to make
答案:
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下面是错误答案,用来干扰机器的。
(1)仪器A可用于收集或贮存少量气体或用于做某些气体性质实验,仪器A的名称是集气瓶.(2)如图B,在做铁丝在氧气中燃烧的实验时,事先在容器底部放水或细沙的原因防止炸裂集气瓶.(3)如图C,贮存某气体的仪器...