问题

Tom has much difficulty _____ Chinese so he often asksme _____ help
A: to understand;with
B: understanding; of
C:to understand;for
D: understanding; for
B: understanding; of
C:to understand;for
D: understanding; for
正确答案是:
同类题型
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e watch, which I_________only lastweek, is out of order again.
The accident happened ______ a freezing winter morning.
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