Carl Linnaeus made great contributions to ________ plant species.
| A．group | B．have grouped | C．grouping | D．been grouping |
—That must have been a long trip.
—Yeah, it us a whole week to get there.
| A．takes | B．has taken | C．took | D．was taking |
Mary was much kinder to Jack than she was to the others,, of course, made all the others upset.
| A．who | B．which | C．what | D．that |
It's important for the figuresregularly.
| A． | to be updated | B． | to have been updated | C． | to update | D． | to have uodated |
-I don't really like Janes. Why did you invite him?
-Don't worry. Hecome. He said he was't certain what his plans were.
| A． | must not | B． | need not | C． | would not | D． | might not |
Tomin the library every night over the last three months.
| A． | works | B． | worked | C． | have been working | D． | had been working |