—I wonder why he has been acting so strange these days.
—Recent pressure at work may ______ his behavior.
| A．account for | B．make for | C．change for | D．stand for |
. “Where is Mother.” “She is in the kitchen. She _______ the housework all morning.”
| A．is doing | B．was doing |
| C．has done | D．has been doing |
On Sundays there were a lot of children playing in the park, _______ parents sat together joking.
| A．their | B．whose | C．which | D．that |
“Was Andrew there when you arrived？” “Yes, but he ______ home soon afterwards.”
| A．had gone | B．has gone |
| C．is going | D．went |
On Sundays there were a lot of children playing in the park, and _______ parents were seated together joking.
| A．their | B．whose | C．which | D．that |
. Please call again. Jim _______ a bath just now.
| A．has had | B．was having |
| C．is having | D．has |