The discovery last week of possible evidence of life on Mars has electrified debate over whether the...

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针打式POS和热敏式POS 固定POS和无线POS 无线智能POS和多媒体POS 接触式POS和非接触式POS

two weeks before last week a week ago before two weeks

lay, lying laid, laying lay, laying lied, lying

will attend had attended was attending 　 would attend

weekend Sunday Saturday Monday

to me the bike last week to me the bike last night me the bike last night last night the bike to me

yesterday tomorrow last night last week

since last week a week ago for a week since a week ago

last week a week ago two weeks before before two weeks

reading；to read to read；reading reading；reading to read；to read

lasts is lasting will last lasted

”SET IRS POS”行空白 ”LAST POS”行空白 ”SET IRS POS”行与”LAST POS”行空白以上说法都不对

take cost spend adjust

I had walked; last week. he had walked; that week. I walked; last week he has walked; last week.

to last last lasted last for

until last week that until last week when not until last week that not until last week when

she drew; the week before I had drawn; that week she had drawn; the week before I drew; the last week

this week every week last week next week