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题型：单选题题类：模拟题难易度：普通

When you are planting trees, the trees ________ straight in the hole.

A、must put B、must be put C、are putting D、is put

举一反三

The sweater can't ______ in the machine.

Heat {#blank#}1{#/blank#} (keep) under the glass and can {#blank#}2{#/blank#} (use) as energy for each house.

Short-term memory can hold about seven item of information at a time. （改为被动语态）

About seven item of information can {#blank#}1{#/blank#} {#blank#}2{#/blank#} at a time by short-term memory.

Waste paper should here.It makes a mess.

Waste paper shouldn't ________ everywhere. We must keep our school clean.

The fruit should {#blank#}1{#/blank#} (keep) well during winter,

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