问题
选择题
_________ your mother _________ some shopping yesterday? [ ]
A. Is; doing
B. Was; doing
C. Did; do
D. Does; do
答案
C
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_________ your mother _________ some shopping yesterday? [ ]
A. Is; doing
B. Was; doing
C. Did; do
D. Does; do
C
In commodity trading, the exchange removes any daily losses from a trader's account and acids any gains to the trader's account. This process is known as :
A．
| A. initial margin. |
B．
| B. maintenance margin. |
C．
| C. marking to market. |